Added README.md

Signed-off-by: ajeetraina <ajeetraina@gmail.com>

nginx-nodejs-redis/README.md

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+## Compose sample application
+
+### Node.js application with Nginx proxy and a Redis database
+
+Project structure:
+```
+.
+├── docker-compose.yml
+├── nginx
+│   ├── Dockerfile
+│   └── nginx.conf
+├── web
+│   ├── Dockerfile
+│   ├── package.json
+│   └── server.js
+├── web1
+│   ├── Dockerfile
+│   ├── package.json
+│   └── server.js
+└── web2
+    ├── Dockerfile
+    ├── package.json
+    └── server.js
+
+4 directories, 12 files
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+version: '3.9'
+services:
+  redis:
+    image: 'redis:alpine'
+    ports:
+      - '6379:6379'
+  web1:
+    restart: on-failure
+    build: ./web1
+    ports:
+      - '81:5000'
+  web2:
+    restart: on-failure
+    build: ./web2
+    ports:
+      - '82:5000'
+  nginx:
+    build: ./nginx
+    ports:
+    - '80:80'
+    depends_on:
+    - web1
+    - web2
+```
+The compose file defines an application with four services `redis`, `web`, `web1` and `web2`.
+When deploying the application, docker-compose maps port 80 of the web service container to port 80 of the host as specified in the file.
+Redis runs on default port 6379. Make sure port 6379 on the host is not being used by another container, otherwise the port should be changed.
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+```
+```
+Creating nginx-nodejs-redis_redis_1 ... done
+Creating nginx-nodejs-redis_web1_1  ... done
+Creating nginx-nodejs-redis_web2_1  ... done
+Creating nginx-nodejs-redis_nginx_1 ... done
+```
+
+
+## Expected result
+
+Listing containers must show three containers running and the port mapping as below:
+
+
+```
+docker-compose ps
+           Name                        Command              State           Ports         
+------------------------------------------------------------------------------------------
+nginx-nodejs-redis_nginx_1   /docker-entrypoint.sh ngin     Up      0.0.0.0:80->80/tcp    
+                             ...                                                          
+nginx-nodejs-redis_redis_1   docker-entrypoint.sh redis     Up      0.0.0.0:6379->6379/tcp
+                             ...                                                          
+nginx-nodejs-redis_web1_1    docker-entrypoint.sh npm       Up      0.0.0.0:81->5000/tcp  
+                             start                                                        
+nginx-nodejs-redis_web2_1    docker-entrypoint.sh npm       Up      0.0.0.0:82->5000/tcp  
+                             start   
+```
+
+## Testing the app
+
+After the application starts, navigate to `http://localhost:80` in your web browser or run:
+
+```
+curl localhost:80
+curl localhost:80
+web1: Total number of visits is: 1
+```
+
+```
+curl localhost:80
+web1: Total number of visits is: 2
+```
+```
+$ curl localhost:80
+web2: Total number of visits is: 3
+```
+
+```
+$ curl localhost:80
+web2: Total number of visits is: 4
+``` 
+
+
+## Stop and remove the containers
+
+```
+$ docker-compose down
+```
+