Merge pull request #355 from WillGibson/initial-contributing-documentation

Add initial contributing to Mutmut documentation

Author: boxed

CONTRIBUTING.rst

@@ -0,0 +1,29 @@
+Contributing to Mutmut
+======================
+
+Setup
+-----
+
+First fork the repository and clone your fork.
+
+Install the dependencies:
+
+.. code-block:: console
+
+    pip install -r requirements.txt -r test_requirements.txt
+
+Running the tests
+-----------------
+
+.. code-block:: console
+
+    pytest
+
+Running your local version of Mutmut against a test codebase
+------------------------------------------------------------
+
+You can install your local version of Mutmut and run it, including any changes you have, made as normal.
+
+.. code-block:: console
+
+    python -m pip install --editable <path_to_mutmut_codebase>

README.rst

@@ -184,3 +184,8 @@ This section describes how to work with mutmut to enhance your test suite.
 Mutmut keeps the data of what it has done and the mutants in the `mutants/`
 directory.If  you want to make sure you run a full mutmut run you can delete
 this directory to start from scratch.
+
+Contributing to Mutmut
+----------------------
+
+If you wish to contribute to Mutmut, please see our `contributing guide <CONTRIBUTING.rst>`_.