Add info and manifest example to README

Author: ApsOps

README.md

@@ -1,2 +1,64 @@
 # kube-nginx-websocket
 Nginx container to load-balance websocket servers in Kubernetes
+
+## Getting Started
+This container is designed to be run in a pod in Kubernetes to proxy websocket requests to a socket server.
+You can provide following environment variables to customize it.
+
+```
+# set env var to dns name of the socket server
+SOCKET_SERVER=socket-service
+```
+
+This is supposed to work with the service exposed via AWS Elastic Loadbalancer. Make sure you [enable proxy protocol in your ELB](http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/enable-proxy-protocol.html).
+
+You should run this as a Kubernetes service. Remember to set `sessionAffinity: ClientIP` to both, this nginx and upstream socket service.
+
+Example manifest:
+
+```
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-socket
+  labels:
+    run: nginx-socket
+spec:
+  type: NodePort
+  ports:
+  - port: 80
+    protocol: TCP
+    nodePort: 31110
+  selector:
+    run: nginx-socket
+  sessionAffinity: ClientIP
+---
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: nginx-socket
+spec:
+  replicas: 3
+  template:
+    metadata:
+      labels:
+        run: nginx-socket
+    spec:
+      containers:
+      - name: nginx-socket
+        image: apsops/kube-nginx-websocket:v0.1
+        ports:
+        - containerPort: 80
+        env:
+          - name: SOCKET_SERVER
+            value: socket-service
+```
+
+## Contributing
+I plan to make this more modular and reliable.
+
+Feel free to open issues and pull requests for bug fixes or features.
+
+## Licence
+
+This project is licensed under the MIT License. Refer [LICENSE](https://github.com/ApsOps/kube-nginx-websocket/blob/master/LICENSE) for details.