feat: add docs/elixir.md (#587)

Co-authored-by: gowshwah <[email protected]>

Author: nodjoy

README.md

@@ -51,6 +51,7 @@ Quick Reference
 [Docker](./docs/docker.md)<!--rehype:style=background: rgb(72 143 223);-->  
 [Dockerfile](./docs/dockerfile.md)<!--rehype:style=background: rgb(0 72 153);&class=tag&data-lang=Docker-->  
 [Django](./docs/django.md)<!--rehype:style=background: rgb(12 75 51);&class=contributing tag&data-lang=Python--> 
+[Elixir](./docs/elixir.md)<!--rehype:style=background: rgb(124 26 156);&class=contributing tag&data-lang=Elixir--> 
 [Flask](./docs/flask.md)<!--rehype:style=background: rgb(210 168 255);&class=contributing tag&data-lang=Python--> 
 [FastAPI](./docs/fastapi.md)<!--rehype:style=background: rgb(210 168 255);&class=contributing tag&data-lang=Python-->
 [Flutter](./docs/flutter.md)<!--rehype:style=background: rgb(150 220 254);&class=contributing tag&data-lang=Dart-->