add readme

Author: lovemyliwu

README.md

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+### Demo
+
+demo for integration nginx http2 server push feature with django
+
+### How to use
+
+> docker-compose up
+
+### NGINX Solution
+
+1. nginx v1.13.9 support server push (see https://www.nginx.com/blog/nginx-1-13-9-http2-server-push/)
+2. enable server push in upstream (see dockerfile/nginx/conf/default.conf)
+
+### Django Solution
+
+1. mark resource which need to be server push in template (see applications/demo/templates/index.html)
+1. add link header through middleware (see applications/demo/middlewares.py)