Add Ziglang template (devcontainers#499)

Author: fardragon

_data/collection-index.yml

@@ -992,3 +992,8 @@
   contact: https://github.com/RouL/devcontainer-features/issues
   repository: https://github.com/RouL/devcontainer-features
   ociReference: ghcr.io/roul/devcontainer-features
+- name: Ziglang devcontainer Template
+  maintainer: fardragon
+  contact: https://github.com/fardragon/devcontainers-zig-template/issues
+  repository: https://github.com/fardragon/devcontainers-zig-template
+  ociReference: ghcr.io/fardragon/devcontainers-zig-template