Add basic conda doc

docs/conda.rst

@@ -0,0 +1,34 @@
+Conda Support
+=============
+
+Read the Docs supports Conda as an environment management tool,
+along with Virtualenv.
+Conda support is useful for people who depend on C libraries,
+and need them installed when building their documentation.
+
+Activating Conda
+----------------
+
+Inside your project,
+there is a `Use Conda` option that will turn on Conda support.
+We support Conda Environment files,
+which specify specific packages to install into the environment.
+
+This Conda environment will also have Sphinx and other build time dependencies installed.
+ It will use the same order of operations that we support currently:
+
+* Environment Creation (``conda create``)
+* Dependency Installation (Sphinx, Mkdocs, etc)
+* User Package Installation (``conda env update``)
+
+
+Custom Installs
+---------------
+
+If you are running a custom installation of Read the Docs,
+you will need the ``conda`` executable installed somewhere on your ``PATH``.
+Because of the way ``conda`` works,
+we can't safely install it as a normal dependency into the normal Python environment.
+
+.. warning:: Installing conda into a virtualenv will override the ``activate`` script,
+             making it so you can't properly activate that virtualenv anymore.