Add sebdanielsson's templates (#544)

Co-authored-by: Álvaro Rausell Guiard <[email protected]>

Author: sebdanielsson

_data/collection-index.yml

@@ -1139,6 +1139,11 @@
   contact: https://github.com/ferdinandkeller/features/issues
   repository: https://github.com/ferdinandkeller/features
   ociReference: ghcr.io/ferdinandkeller/features/httpie
+- name: sebdanielsson's templates
+  maintainer: Sebastian Danielsson (@sebdanielsson)
+  contact: https://github.com/sebdanielsson/devcontainers/issues
+  repository: https://github.com/sebdanielsson/devcontainers
+  ocireference: ghcr.io/sebdanielsson/devcontainers
 - name: Rojo Feature
   maintainer: Ryan Luu
   contact: https://github.com/RyanLua/features/issues