Add node documentation

bitnami/node/README.md

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+# Bitnami Node.js Docker Container
+
+## Introduction to Bitnami containers
+Bitnami provides easy-to-use, consistently configured, and always up-to-date container images. [Click here](https://bitnami.com) for more information on our packaging approach.
+
+## What is Node.js?
+Node.js allows developers to build scalable, real-time web applications with two-way connections between the client and server.
+
+## Usage
+You can instantiate a Bitnami Node.js container by doing:
+
+```
+HOST_NODE_APP_DIR=`pwd`/node_app
+HOST_NODE_SERVER_PORT=8080
+CONTAINER_NODE_SERVER_NAME=node-app
+docker run -it \
+  -p $HOST_NODE_SERVER_PORT:80 \
+  -v $HOST_NODE_APP_DIR:/node_app \
+  --name $CONTAINER_NODE_SERVER_NAME
+  bitnami/node
+```
+
+## Linking
+
+You can link the Node.js to a container running your application, e.g., using the Bitnami nginx container:
+
+```
+CONTAINER_NODE_LINK_NAME=node-app
+docker run --rm -it \
+    --link $CONTAINER_NODE_SERVER_NAME:$CONTAINER_NODE_LINK_NAME \
+    -v $HOST_NODE_APP_DIR:/app bitnami/nginx
+```
+
+Inside your application, use the value of $CONTAINER_NODE_LINK_NAME when setting up your virtual host.
+The Bitnami nginx container comes with an example virtual host for connecting to this Node.js container.
+
+## Logging
+
+The container is set up to log to stdout, which means logs can be obtained as follows:
+
+```
+docker logs $CONTAINER_NODE_SERVER_NAME
+```
+
+If you would like to log to a file instead, you can mount a volume at `/logs`.