Add a README section on 'Compilation' (python#244)

matrixise · ncoghlan · commit 3e931cae6197 · 2017-07-26T16:44:17.000+10:00
diff --git a/README.rst b/README.rst
@@ -10,3 +10,13 @@ This guide covers how to contribute to CPython. It is known by the
 nickname of "the devguide" by the Python core developers.
 
 The official home of this guide is https://devguide.python.org.
+
+Compilation
+-----------
+
+For the compilation of the devguide, you need to use a version of Python which
+supports the ``venv`` module, because the ``make html`` command will create a
+virtual environment and will install the ``Sphinx`` package::
+
+    make html
+
