Update examples

examples/callback_queries.py

@@ -0,0 +1,16 @@
+"""This example shows how to handle callback queries, i.e.: queries coming from inline button presses.
+
+It uses the @on_callback_query decorator to register a CallbackQueryHandler.
+"""
+
+from pyrogram import Client
+
+app = Client("123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11")
+
+
+@app.on_callback_query()
+def answer(client, callback_query):
+    callback_query.answer('Button contains: "{}"'.format(callback_query.data), show_alert=True)
+
+
+app.run()  # Automatically start() and idle()