Add Bypass Template Rendering as a phoenix til

phoenix/bypass-template-rendering.md

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+# Bypass Template Rendering
+
+Generally when rendering a response to a request in a Phoenix app, the
+controller will make a render call that targets a specific template. If it
+suits our needs, we can skip writing a template and bypass the template
+portion of the response pipeline by implementing our own `render` function
+directly in the view module.
+
+Consider the following route and controller action:
+
+```elixir
+# web/router.ex
+get "/hello", UserController, :hello
+
+# web/controllers/user_controller.ex
+def hello(conn, _params) do
+  render(conn, "hello.html")
+end
+```
+
+The render call would normally trigger a corresponding template function,
+but we bypass it by adding the following function to our view module:
+
+```elixir
+# web/views/user_view.ex
+def render("hello.html", _assigns) do
+  "Hello, World!"
+end
+```
+
+Visiting `/hello` will render a page with the view's layout and the words
+"Hello, World!".