Update collection-index.yml (#540)

Author: prplecake

_data/collection-index.yml

@@ -997,6 +997,11 @@
   contact: https://github.com/RouL/devcontainer-features/issues
   repository: https://github.com/RouL/devcontainer-features
   ociReference: ghcr.io/roul/devcontainer-features
+- name: devcontainer features by prplecake
+  maintainer: Matthew Jorgensen (prplecake)
+  contact: https://github.com/prplecake/devcontainer-features/issues
+  repository: https://github.com/prplecake/devcontainer-features
+  ociReference: ghcr.io/prplecake/devcontainer-features
 - name: Ziglang devcontainer Template
   maintainer: fardragon
   contact: https://github.com/fardragon/devcontainers-zig-template/issues