added "docs/en" directory and moved

doc/en/develop.txt

@@ -0,0 +1,40 @@
+=================================================
+Feedback and contribute to py.test
+=================================================
+
+.. toctree::
+   :maxdepth: 2
+
+   contact.txt
+
+.. _checkout:
+
+Working from version control or a tarball
+=================================================
+
+To follow development or start experiments, checkout the
+complete code and documentation source with mercurial_::
+
+    hg clone https://bitbucket.org/hpk42/pytest/
+
+You can also go to the python package index and
+download and unpack a TAR file::
+
+    http://pypi.python.org/pypi/pytest/
+
+Activating a checkout with setuptools
+--------------------------------------------
+
+With a working Distribute_ or setuptools_ installation you can type::
+
+    python setup.py develop
+
+in order to work inline with the tools and the lib of your checkout.
+
+If this command complains that it could not find the required version
+of "py" then you need to use the development pypi repository::
+
+    python setup.py develop -i http://pypi.testrun.org
+
+
+.. include:: links.inc