docs: add pull request template

.github/pull_request_template.md

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+* **Please check if the PR fulfills these requirements**
+- [ ] You have read the contribution guidelines [guidelines](https://github.com/JordanKnott/taskcafe/blob/master/CONTRIBUTING.md)
+- [ ] The commit message follows our [guidelines](https://github.com/JordanKnott/taskcafe/blob/master/CONTRIBUTING.md#git-commit-message-style)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+
+* **What kind of change does this PR introduce?** (Bug fix, feature, docs update, ...)
+
+
+* **What is the current behavior?** (You can also link to an open issue here)
+
+
+* **What is the new behavior (if this is a feature change)?**
+
+
+* **Does this PR introduce a breaking change?** (What changes might users need to make in their application due to this PR?)
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+* **Other information**: