write readme file

examples/django_chat/readme.md

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+# python-socketio with django example
+
+This example is for who wants to use django with pyton-socketio. Some truck used in this example is inspired by gevent-socketio.
+
+# How to Setup
+
+```sh
+pip install -r requirement.txt
+python manage.py migrate
+```
+
+# How to Run
+
+```sh
+python manage.py runserver_socketio
+```
+
+open http://127.0.0.1:8000/ with your browser to see the result

examples/django_chat/requirement.txt

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+Django<1.9
+eventlet
+python-socketio