added template collection for Clojure (devcontainers#418)

Adding devcontainer templates for Clojure language

Author: behrica

_data/collection-index.yml

@@ -812,4 +812,9 @@
   maintainer: Tony Najjar
   contact: https://github.com/tonynajjar/ros2_devcontainer_template/issues
   repository: https://github.com/tonynajjar/ros2_devcontainer_template/
-  ociReference: ghcr.io/tonynajjar/ros2_devcontainer_template
+  ociReference: ghcr.io/tonynajjar/ros2_devcontainer_template
+- name: Clojure devcontainer templates
+  maintainer: Carsten Behring
+  contact: https://github.com/scicloj/devcontainer-templates/issues
+  repository: https://github.com/scicloj/devcontainer-templates/
+  ociReference: ghcr.io/scicloj/devcontainer-templates