Add How-to-release doc

docs/How-to-release.md

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+# Apache SkyWalking Python Release Guide
+
+This documentation guides the release manager to release the SkyWalking Python in the Apache Way, and also helps people to check the release for vote.
+
+## Prerequisites
+
+1. Close (if finished, or move to next milestone otherwise) all issues in the current milestone from [skywalking-python](https://github.com/apache/skywalking-python/milestones) and [skywalking](https://github.com/apache/skywalking/milestones), create a new milestone if needed.
+2. Update [CHANGELOG.md](../CHANGELOG.md) and `version` in [setup.py](../setup.py).
+
+
+## Add your GPG public key to Apache svn
+
+1. Upload your GPG public key to a public GPG site, such as [MIT's site](http://pgp.mit.edu:11371/). 
+
+1. Log in [id.apache.org](https://id.apache.org/) and submit your key fingerprint.
+
+1. Add your GPG public key into [SkyWalking GPG KEYS](https://dist.apache.org/repos/dist/release/skywalking/KEYS) file, **you can do this only if you are a PMC member**.  You can ask a PMC member for help. **DO NOT override the existed `KEYS` file content, only append your key at the end of the file.**
+
+
+## Build and sign the source code package
+
+```shell
+export VERSION=<the version to release>
+
+git clone --recurse-submodules git@github.com:apache/skywalking-python && cd skywalking-python
+git tag -a "v$VERSION" -m "Release Apache SkyWalking-Python $VERSION"
+git push --tags
+
+make clean && make release
+```
+
+## Upload to Apache svn
+
+```bash
+svn co https://dist.apache.org/repos/dist/dev/skywalking/python release/skywalking/python
+mkdir -p release/skywalking/python/"$VERSION"
+cp skywalking-python/skywalking*.tgz release/skywalking/python/"$VERSION"
+cp skywalking-python/skywalking*.tgz.asc release/skywalking/python/"$VERSION"
+cp skywalking-python/skywalking-python*.tgz.sha512 release/skywalking/python/"$VERSION"
+
+cd release/skywalking && svn add python/$VERSION && svn commit python -m "Draft Apache SkyWalking-Python release $VERSION"
+```
+
+## Make the internal announcement
+
+Send an announcement email to dev@ mailing list, **please check all links before sending the email**, the same below.
+
+```text
+Subject: [ANNOUNCEMENT] Apache SkyWalking Python $VERSION test build available
+
+Content:
+
+The test build of Apache SkyWalking Python $VERSION is now available.
+
+We welcome any comments you may have, and will take all feedback into
+account if a quality vote is called for this build.
+
+Release notes:
+
+ * https://github.com/apache/skywalking-python/blob/v$VERSION/CHANGELOG.md
+
+Release Candidate:
+
+ * https://dist.apache.org/repos/dist/dev/skywalking/python/$VERSION
+ * sha512 checksums
+   - sha512xxxxyyyzzz skywalking-python-src-x.x.x.tgz
+
+Release Tag :
+
+ * (Git Tag) v$VERSION
+
+Release Commit Hash :
+
+ * https://github.com/apache/skywalking-python/tree/<Git Commit Hash>
+
+Keys to verify the Release Candidate :
+
+ * http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8BD99F552D9F33D7 corresponding to kezhenxu94@apache.org
+
+Guide to build the release from source :
+
+ * https://github.com/apache/skywalking-python/blob/master/CONTRIBUTING.md#compiling-and-building
+
+A vote regarding the quality of this test build will be initiated
+within the next couple of days.
+```
+
+## Wait at least 48 hours for test responses
+
+Any PMC, committer or contributor can test features for releasing, and feedback.
+Based on that, PMC will decide whether to start a vote or not.
+
+## Call for vote in dev@ mailing list
+
+Call for vote in `dev@skywalking.apache.org`.
+
+```text
+Subject: [VOTE] Release Apache SkyWalking Python version $VERSION
+
+Content:
+
+Hi the SkyWalking Community:
+This is a call for vote to release Apache SkyWalking Python version $VERSION.
+
+Release notes:
+
+ * https://github.com/apache/skywalking-python/blob/v$VERSION/CHANGELOG.md
+
+Release Candidate:
+
+ * https://dist.apache.org/repos/dist/dev/skywalking/python/$VERSION
+ * sha512 checksums
+   - sha512xxxxyyyzzz skywalking-python-src-x.x.x.tgz
+
+Release Tag :
+
+ * (Git Tag) v$VERSION
+
+Release Commit Hash :
+
+ * https://github.com/apache/skywalking-python/tree/<Git Commit Hash>
+
+Keys to verify the Release Candidate :
+
+ * https://dist.apache.org/repos/dist/release/skywalking/KEYS
+
+Guide to build the release from source :
+
+ * https://github.com/apache/skywalking-python/blob/master/CONTRIBUTING.md#compiling-and-building
+
+Voting will start now and will remain open for at least 72 hours, all PMC members are required to give their votes.
+
+[ ] +1 Release this package.
+[ ] +0 No opinion.
+[ ] -1 Do not release this package because....
+
+Thanks.
+
+[1] https://github.com/apache/skywalking/blob/master/docs/en/guides/How-to-release.md#vote-check
+```
+
+## Vote Check
+
+All PMC members and committers should check these before voting +1:
+
+1. Features test.
+1. All artifacts in staging repository are published with `.asc`, `.md5`, and `sha` files.
+1. Source codes and distribution packages (`skywalking-python-src-$VERSION.tgz`)
+are in `https://dist.apache.org/repos/dist/dev/skywalking/python/$VERSION` with `.asc`, `.sha512`.
+1. `LICENSE` and `NOTICE` are in source codes and distribution package.
+1. Check `shasum -c skywalking-python-src-$VERSION.tgz.sha512`.
+1. Check `gpg --verify skywalking-python-src-$VERSION.tgz.asc skywalking-python-src-$VERSION.tgz`.
+1. Build distribution from source code package by following this [the build guide](#build-and-sign-the-source-code-package).
+1. Licenses check, `make license`.
+
+Vote result should follow these:
+
+1. PMC vote is +1 binding, all others is +1 no binding.
+
+1. Within 72 hours, you get at least 3 (+1 binding), and have more +1 than -1. Vote pass. 
+
+1. **Send the closing vote mail to announce the result**.  When count the binding and no binding votes, please list the names of voters. An example like this:
+
+   ```
+   [RESULT][VOTE] Release Apache SkyWalking Python version $VERSION
+
+   72+ hours passed, we’ve got ($NUMBER) +1 bindings (and ... +1 non-bindings):
+
+   (list names)
+   +1 bindings:
+   xxx
+   ...
+
+   +1 non-bindings:
+   xxx
+   ...
+
+   Thank you for voting, I’ll continue the release process.
+   ```
+
+## Publish release
+
+1. Move source codes tar balls and distributions to `https://dist.apache.org/repos/dist/release/skywalking/`, **you can do this only if you are a PMC member**.
+
+    ```shell
+    svn mv https://dist.apache.org/repos/dist/dev/skywalking/python/"$VERSION" https://dist.apache.org/repos/dist/release/skywalking/python/"$VERSION"
+    ```
+
+1. Refer to the previous [PR](https://github.com/apache/skywalking-website/pull/132), update news and links on the website. There are several files need to modify.
+
+1. Update [Github release page](https://github.com/apache/skywalking-python/releases), follow the previous convention.
+
+1. Send ANNOUNCE email to `dev@skywalking.apache.org` and `announce@apache.org`, the sender should use his/her Apache email account. 
+
+    ```
+    Subject: [ANNOUNCEMENT] Apache SkyWalking Python $VERSION Released
+
+    Content:
+
+    Hi the SkyWalking Community
+
+    On behalf of the SkyWalking Team, I’m glad to announce that SkyWalking Python $VERSION is now released.
+
+    SkyWalking Python: The Python Agent for Apache SkyWalking, which provides the native tracing abilities for Python project.
+
+    SkyWalking: APM (application performance monitor) tool for distributed systems, especially designed for microservices, cloud native and container-based (Docker, Kubernetes, Mesos) architectures.
+
+    Download Links: http://skywalking.apache.org/downloads/
+
+    Release Notes : https://github.com/apache/skywalking-python/blob/v$VERSION/CHANGELOG.md
+
+    Website: http://skywalking.apache.org/
+
+    SkyWalking Python Resources:
+- Issue: https://github.com/apache/skywalking/issues
+    - Mailing list: dev@skywalking.apache.org
+    - Documents: https://github.com/apache/skywalking-python/blob/v$VERSION/README.md
+
+    The Apache SkyWalking Team
+```
+
+