welcome page and documentatino

app/controllers/pages_controller.rb

@@ -0,0 +1,15 @@
+class PagesController < ActionController::Base
+  layout "public"
+  protect_from_forgery with: :exception
+
+  # GET /
+  # Public landing page introducing the SMS Gateway API.
+  def home
+  end
+
+  # GET /docs
+  # Interactive API documentation covering every endpoint, the WebSocket
+  # protocol, webhooks, authentication, rate limits, and error codes.
+  def docs
+  end
+end