Add Serve Static Assets From Custom Directory as a phoenix til

phoenix/serve-static-assets-from-custom-directory.md

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+# Serve Static Assets From Custom Directory
+
+When you new up a Phoenix project, an `endpoint.ex` file will be generated.
+This file is full of different plugs for handling incoming traffic. The
+`Plug.Static` declaration specifies how your application will handle and
+serve requests for static files.
+
+```elixir
+  plug Plug.Static,
+    at: "/", from: :my_app, gzip: false,
+    only: ~w(css fonts images js favicon.ico robots.txt)
+```
+
+The `from` options declares where these static files are located. In this
+case it references our application (`:my_app`) as the target which will
+translate to its `priv/static` directory.
+
+If you instead want to serve your files from a different, custom directory,
+you can replace it with the path to that directory.
+
+```elixir
+  plug Plug.Static,
+    at: "/", from: "priv/my_frontend/static", gzip: false,
+    only: ~w(css fonts images js favicon.ico robots.txt)
+```
+
+[source](https://hexdocs.pm/plug/Plug.Static.html)