Add features smlnj and VIM from souce. (#484)

Co-authored-by: Samruddhi Khandale <[email protected]>

Author: MartinAskestad

_data/collection-index.yml

@@ -952,6 +952,11 @@
   contact: https://github.com/rhiroe/features/issues
   repository: https://github.com/rhiroe/features
   ociReference: ghcr.io/rhiroe/features
+- name: devcontainer features by martinaskestad
+  maintainer: martinaskestad
+  contact: https://github.com/martinaskestad/features/issues
+  repository: https://github.com/martinaskestad/features
+  ociReference: ghcr.io/martinaskestad/features
 - name: devcontainer features for wolfi base docker image
   maintainer: David Zucker
   contact: https://github.com/davzucky/devcontainers-features-wolfi/issues