feat(collection-index): Add Oh My Posh Dev Container Features (#652)

- Add Oh My Posh Dev Container Features entry to collection index
- Include maintainer information (Bipin Paul)
- Add contact link to GitHub issues repository
- Add repository reference to iambipinpaul/devcontainer-features
- Add OCI reference for ghcr.io/iambipinpaul/devcontainer-features

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

Author: iAmBipinPaul

_data/collection-index.yml

@@ -1361,3 +1361,8 @@
   contact: https://github.com/peakys-org/blender-devcontainer/issues/
   repository: https://github.com/peakys-org/blender-devcontainer/
   ociReference: ghcr.io/peakys-org/blender-devcontainer/blender-devcontainer
+- name: Oh My Posh Dev Container Features
+  maintainer: Bipin Paul
+  contact: https://github.com/iambipinpaul/devcontainer-features/issues
+  repository: https://github.com/iambipinpaul/devcontainer-features
+  ociReference: ghcr.io/iambipinpaul/devcontainer-features