Added SPFx Dev Container

Author: tpalacino

_data/collection-index.yml

@@ -788,3 +788,8 @@
   contact: https://github.com/rafaph/devcontainer-features/issues
   repository: https://github.com/rafaph/devcontainer-features
   ociReference: ghcr.io/rafaph/devcontainer-features
+- name: SPFx Dev Container
+  maintainer: Troy
+  contact: https://github.com/tpalacino/SPFx-dev-container/issues
+  repository: https://github.com/tpalacino/SPFx-dev-container
+  ociReference: ghcr.io/tpalacino/spfx-dev-container