Adding an elixir-mode snippet for phoenix liveview handle params function.

Author: djgoku

snippets/elixir-mode/phx-lv-handle-params

@@ -0,0 +1,9 @@
+# -*- mode: snippet -*-
+# name: phx-lv-handle-params
+# key: phx-lv-handle-params
+# --
+@impl true
+def handle_params(params, _uri, socket) do
+  $0
+  {:noreply, socket}
+end