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+# How to contribute
+
+If your are considering creating a pull request, please observe the following:
+
+- If you are adding or modifying a feature, add *new* unit tests that test that feature.
+- If you are fixing a bug, add a unit test that *fails* before the bug fix is implemented.
+- Do not initiate a pull request until all of the units tests pass.
+- Branches should be based on the branch `master`.
+
+There is a project file for VS2022 for C++14, 17, 20, and bash scripts that run the tests for C++11, 14, 17, 20 under Linux with GCC and Clang.