Update collection-index.yml (devcontainers#185)

Author: curtisma

_data/collection-index.yml

@@ -373,6 +373,11 @@
   contact: https://github.com/michidk/
   repository: https://github.com/michidk/devcontainers-features
   ociReference: ghcr.io/michidk/devcontainers-features
+- name: Integrated Circuit Design Environment Templates
+  maintainer: Curtis Mayberry
+  contact: https://github.com/curtisma/
+  repository: https://github.com/cascode-labs/viper-ic-devcontainers
+  ociReference: ghcr.io/cascode-labs/viper-ic-devcontainers
 - name: A powerful and handy feature that runs remote shell scripts
   maintainer: Xiaowei Wang
   contact: https://github.com/wxw-matt/devcontainer-features/issues