Use a pull-request template for new rock-on submissions

.github/pull_request_template.md

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+> To ease and accelerate the PR submission, please use the template below to provide all requested information.
+> You can find guidelines on which docker image to use in the [Rockstor's documentation](http://rockstor.com/docs/contribute_rockons.html#which-docker-image-should-i-use), 
+> as well as examples of proper formatting in other rock-ons ([here](https://github.com/rockstor/rockon-registry/blob/master/teamspeak3.json)
+> and [here](https://github.com/rockstor/rockon-registry/blob/master/nextcloud-official.json))
+
+
+
+Fixes # .
+
+### General information on project
+This pull request proposes to add a new rock-on for the following project:
+- name:
+- website:
+- description: <brief description of the project and how it intergrates with Rockstor>
+
+### Information on docker image
+- docker image: <link to image page on docker hub>
+- is an official docker image available for this project?: 
+
+
+### Checklist
+- [ ] Passes [JSONlint](https://jsonlint.com) validation
+- [ ] Entry added to `root.json` in _alphabetical_ order (for new rock-on only)
+- [ ] `"description"` object lists and links to the docker image used
+- [ ] `"description"` object provides information on the image's particularities (advantage over another existing rock-on for the same project, for instance)
+- [ ] `"website"` object links to project's main website