w3cj dev container features to collection index (#646)

Co-authored-by: Abdurrahmaan Iqbal <137001048+abdurriq@users.noreply.github.com>

Author: w3cj

_data/collection-index.yml

@@ -1371,3 +1371,8 @@
   contact: https://github.com/OpenTechIL/offline-python-vscode-devcontainer/issues
   repository: https://github.com/OpenTechIL/offline-python-vscode-devcontainer
   ociReference: ghcr.io/opentechil/offline-python-vscode-devcontainer
+- name: Dev Container Features by w3cj
+  maintainer: w3cj
+  contact: https://github.com/w3cj/devcontainer-features/issues
+  repository: https://github.com/w3cj/devcontainer-features
+  ociReference: ghcr.io/w3cj/devcontainer-features