Create PR template

Author: janndriessen

.github/pull_request_template.md

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+## **Summary of Changes**
+
+
+Fixes # _(if applicable - add the number of issue this PR addresses)_
+
+ 
+
+## **Test Data or Screenshots**
+
+ 
+
+###### _By submitting this pull request, you are confirming the following:_
+
+- I have reviewed the [Contribution Guidelines]([https://github.com/IndexCoop/index-app/blob/master/CONTRIBUTING.md](https://github.com/web3swift-team/web3swift/blob/develop/CONTRIBUTION.md)).
+- I have performed a self-review of my own code.
+- I have updated my repository to match the `develop` branch.
+- I have included test data or screenshots that prove my fix is effective or that my feature works.
+- I have checked that all tests work and swiftlint is not throwing any errors/warnings.