Create README.md

Author: nejat-njonjo

README.md

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+# proxyserver
+A proxy server using Nginx and Docker.
+
+# USAGE
+  - ## Heroku
+      When using heroku replace a listening port with ENV variable ```$PORT```
+  - ## Local
+      Create networks with other containers and build the image.
+  - ## Google Cloud
+      Change the listening port to 8080