Update examples

examples/echo.py

@@ -0,0 +1,17 @@
+"""This simple echo bot replies to every private text message.
+
+It uses the @on_message decorator to register a MessageHandler and applies two filters on it:
+Filters.text and Filters.private to make sure it will reply to private text messages only.
+"""
+
+from pyrogram import Client, Filters
+
+app = Client("my_account")
+
+
+@app.on_message(Filters.text & Filters.private)
+def echo(client, message):
+    message.reply(message.text)
+
+
+app.run()  # Automatically start() and idle()