added pull request Template (#91)

* added pull request Template

* added pull request Template

.github/pull_request_template.md

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+
+<!-- In order to keep off topic discussion to a minimum, it helps if the "work to be done" is already agreed on. -->
+<!-- Ideally, a GitHub Issue with the label `Status: Consensus` will have been concluded, and linked to in this PR. -->
+<!--
+Thanks for submitting a pull request! Please provide enough information so that others can review your pull request.
+-->
+
+**What kind of change does this PR introduce?**
+
+<!-- E.g. a bugfix, feature, refactoring, etc… -->
+
+**Issue Number:**
+<!-- Pick one of the below options.  Please remove those which don't apply. -->
+-  Closes #___ <!-- Replace ___ with the issue number this PR resolves -->
+-  Related to #___ <!-- Use when the PR doesn't completely resolve an issue -->
+-  Others? <!-- Add any additional notes or references here -->
+
+**Screenshots/videos:**
+
+<!--Add screenshots or videos wherever possible.-->
+
+**If relevant, did you update the documentation?**
+
+<!--Add link to it-->
+
+**Summary**
+
+<!-- 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. -->
+
+**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. -->