Add a pull request template

pull_request_template.md

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+This PR is resolving #...
+
+Changes in this PR:
+
+-
+-
+-
+
+## General guideline:
+
+- If this PR is ready to be merged (and all checkboxes below are either ticked or not applicable), make this a regular PR
+- If this PR still needs work, please make this a draft PR
+  - If you wish to get feedback/code-review, please add the label RFC to this PR
+
+Please verify that all things listed below were considered and check them. If an item doesn't apply to this type of PR (for example a documentation change doesn't need to be performance tested), you should make a ~~strikethrough~~ (markdown syntax: `~~strikethrough~~`). More infos on the guidlines can be found [here](https://github.com/apple/foundationdb/wiki/FoundationDB-Commit-Process).
+
+### Style
+[] All variable and function names make sense.
+[] The code is properly formatted (consider running `git clang-format`).
+
+### Performance
+[] All CP-hot paths are well optimized.
+[] The proper containers are used (for example `std::vector` vs `VectorRef`).
+[] There are no new known `SlowTask` traces.
+
+### Testing
+[] The code was sufficiently tested in simulation.
+[] If there are new parameters or knobs, different values are tested in simulation.
+[] `ASSERT`, `ASSERT_WE_THINK`, and `TEST` macros are added in appropriate places.
+[] Unit tests were added for new algorithms and data structure that make sense to unit-test
+[] If this is a bugfix: there is a test that can easily reproduce the bug.