document ci

docs/html/development/ci.rst

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+======================
+Continuous Integration
+======================
+
+Checks
+======
+
+`pip` CI runs different kind of tests:
+
+- lint (defined in `.pre-commit-config.yaml`)
+- docs
+- vendoring (is the `src/_internal/_vendor` directory cleanly vendored)
+- unit tests (present in `tests/unit`)
+- "integration" tests
+- package (test the packaging steps)
+
+
+Tested interpreters
+===================
+
+pip is tested on a variety of Python interpreters:
+
+  - CPython 2.7
+  - CPython 3.5
+  - CPython 3.6
+  - CPython 3.7
+  - CPython 3.8
+  - Latest PyPy
+  - Latest PyPy3
+
+on different operating systems:
+
+  - Linux
+  - Windows
+  - MacOS
+
+and on different architectures:
+
+  - x64
+  - x86
+
+Services
+========
+
+pip test suite and checks are distributed on three different platforms that
+provides free executors for open source packages:
+
+  - `Travis CI`_ (Used for Linux)
+  - `Appveyor CI`_ (Windows only)
+  - 'Azure DevOps`_ (Linux, MacOS & Windows tests)
+
+.. _`Travis CI`: https://travis-ci.org/
+.. _`Appveyor CI`: https://www.appveyor.com/
+.. _`Azure DevOps CI`: https://dev.azure.com/