Add introduction for bdk-cli

docs/.vuepress/config.js

@@ -18,6 +18,7 @@ const docsSidebar = [
         title: "BDK-CLI",
         collapsable: true,
         children: [
+          '/bdk-cli/introduction',
           '/bdk-cli/installation',
           '/bdk-cli/concept',
           '/bdk-cli/interface',

docs/bdk-cli/introduction.md

@@ -0,0 +1,13 @@
+# Introduction
+
+[`bdk-cli`](https://github.com/bitcoindevkit/bdk-cli) is a lightweight [`repl`](https://codewith.mu/en/tutorials/1.0/repl) wrapper over `bdk` that comes as a command line application. It is useful for quick testing and prototyping of bdk functionalities.
+
+This can also be used as an example application to create your own command line bitcoin wallet tool using bdk.
+
+`bdk-cli` can interface with all the blockchain backends currently supported by `bdk`, like `rpc`, `electrum`, `esplora` and `compact_filters`.
+
+<!-- `bdk-cli` comes with `regtest-*` features that can automatically deploy a regtest backend with a connected `bdk` wallet in background. This can be useful If you don't want to setup your own regtest node or try out quick tests, especially in `repl` mode. -->
+
+Check out [project documentation](https://docs.rs/bdk-cli/0.3.0/bdk_cli/) for more details.
+
+The following sections goes into more details on the installation and usage of `bdk-cli`.