Add webhook examples

examples/webhook_examples/README.md

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+# Webhook examples using pyTelegramBotAPI
+
+There are 3 examples in this directory using different libraries:
+
+* **Python (CPython):** *webhook_cpython_echo_bot.py*
+  * **Pros:**
+    * Official python libraries, it works out of the box (doesn't require to
+      install anything).
+    * Works with Python 2 and Python 3 (need to be converted with 2to3).
+  * **Cons:**
+    * Ugly code.
+    * Many things to handle yourself, this can lead to errors.
+    * Not powerful, do the trick but the performance is low.
+
+* **CherryPy (3.8.0):** *webhook_cherrypy_echo_bot.py*
+  * **Pros:**
+    * It's a web application framework, cleaner code, uses objects for defining
+      the web application.
+    * Very good performance.
+    * The project seems to be active, latest version is recent.
+    * Works with Python 2 and Python 3.
+  * **Cons:**
+    * Some things are not very intuitive, reading the doc is a must.
+
+* **Flask (0.10.1):** *webhook_flask_echo_bot.py*
+  * **Pros:**
+    * It's a web application framework, cleaner code, uses decorator which can
+      be nice.
+    * Good performance.
+    * It's intuitive if you know how web application works.
+  * **Cons:**
+    * The project seems not to be very active, latest version dates 2013.
+    * They don't recommend to use it with Python 3, but may work.
+    * May be a oversized for just handling webhook petitions.
+
+*Latest update of this document: 2015-10-06*