Create pull_request_template.md

Author: mbastian

.github/pull_request_template.md

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+## New plugin or plugin update?
+
+* [ ] New Plugin
+* [ ] Update
+
+## What is the purpose of this plugin?
+
+  
+## How to test your plugin in Gephi?
+
+1.
+2.
+
+## Checklist before submission
+
+* [ ] Did you merged with the `master` branch to get the latest updates?
+* [ ] Did you build and test the plugin successfully locally?
+* [ ] Did you include metadata (e.g. plugin author, license) in the `pom.xml` file
+* [ ] Did you make sure NOT to include any unecessary files in your PR?
+* [ ] Did you write unit tests to test your plugin functionalities?