added README

README.md

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+# ht-docker-node
+
+This image is available on DockerHub. Specify it as base image like so:
+
+```Dockerfile
+FROM hosttoday/ht-docker-node
+```
+
+## Status
+
+## Usage
+This image has nvm, node and npm in PATH.
+So if you need an image with a special node version (useful for CI/CA/CD) you can do
+
+```sh
+nvm install [node_version_number]
+nvm alias default [node_version_number]
+```