Create PULL_REQUEST_TEMPLATE.md

inspired by webpack's template

Author: ZoltanVeres

PULL_REQUEST_TEMPLATE.md

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+<!-- Thanks for submitting a pull request! Please provide enough information so that others can review your pull request. -->
+<!-- Explain the **motivation** for making this change. What existing problem does the pull request solve? -->
+<!-- Try to link to an open issue for more information. -->
+
+
+<!-- In addition to that please answer these questions: -->
+
+**What kind of change does this PR introduce?**
+
+<!-- E.g. a bugfix, feature, refactoring, build related change, etc… -->
+
+**Does this PR introduce a breaking change?**
+
+<!-- If this PR introduces a breaking change, please describe the impact and a migration path for existing applications. -->
+
+**What needs to be documented once your changes are merged?**
+
+<!-- List all the information that needs to be added to the documentation after merge -->
+<!-- When your changes are merged you will be asked to contribute this to the documentation -->