Add more documentation

src/kemal/handler.cr

@@ -1,7 +1,9 @@
 require "http/server"
 require "uri"
 
-# Handles the routes
+# Kemal::Handler is the main handler which handles all the HTTP requests. Routing, parsing, rendering e.g
+# are done in this handler.
+
 class Kemal::Handler < HTTP::Handler
   INSTANCE = new
 

src/kemal/websocket_handler.cr

@@ -1,3 +1,6 @@
+# Kemal::WebsocketHandler is used for each define WebSocket route.
+# For each WebSocket route a new handler is created and registered to global handlers.
+
 class Kemal::WebsocketHandler < HTTP::WebSocketHandler
   def initialize(@path, &@proc : WebSocketSession ->)
     Kemal.config.add_ws_handler self