docs(generators:openshift): create openshift.md

[skip ci]

Author: Awk34

docs/generators/openshift.md

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+###Openshift
+
+> Note: Openshift uses a quite old version of Node by default. We strongly recommend updating your Node version. [Here's a helpful article](https://blog.openshift.com/any-version-of-nodejs-you-want-in-the-cloud-openshift-does-it-paas-style/).
+
+Deploying to OpenShift can be done in just a few steps:
+
+    yo angular-fullstack:openshift
+
+A live application URL will be available in the output.
+
+> **oAuth**
+>
+> If you're using any oAuth strategies, you must set environment variables for your selected oAuth. For example, if we're using Facebook oAuth we would do this :
+>
+>     rhc set-env FACEBOOK_ID=id -a my-openshift-app
+>     rhc set-env FACEBOOK_SECRET=secret -a my-openshift-app
+>
+> You will also need to set `DOMAIN` environment variable:
+>
+>     rhc set-env DOMAIN=<your-openshift-app-name>.rhcloud.com
+>
+>     # or (if you're using it):
+>
+>     rhc set-env DOMAIN=<your-custom-domain>
+>
+> After you've set the required environment variables, restart the server:
+>
+>     rhc app-restart -a my-openshift-app
+
+To make your deployment process easier consider using [grunt-build-control](https://github.com/robwierzbowski/grunt-build-control).
+
+**Pushing Updates**
+
+    grunt
+
+Commit and push the resulting build, located in your dist folder:
+
+    grunt buildcontrol:openshift