Update README and add guidelines for CONTRIBUTING

Rename 'Readme.txt' to 'README.rst', format the documentation as
reStructuredText, and modernize the content.  Also add a new
'CONTRIBUTING.rst' explaining the preferred entry path for new
contributors.

1 files changed, 29 insertions, 0 deletions

diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
new file mode 100644
index 0000000000..2ebe9b62ec
--- /dev/null
+++ b/CONTRIBUTING.rst
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+Contributing to CMake
+*********************
+
+Community
+=========
+
+The preferred entry point for new contributors is the mailing list.
+Please subscribe and post to the `CMake Developers List`_ to offer
+contributions.  Regular and productive contributors may be invited
+to gain direct push access.
+
+.. _`CMake Developers List`: http://www.cmake.org/mailman/listinfo/cmake-developers
+
+Patches
+=======
+
+Please base all new work on the ``master`` branch.  Then use
+``git format-patch`` to produce patches suitable to post to
+the mailing list.
+
+License
+=======
+
+We do not require any formal copyright assignment or contributor license
+agreement.  Any contributions intentionally sent upstream are presumed
+to be offerred under terms of the OSI-approved BSD 3-clause License.
+See `Copyright.txt`_ for details.
+
+.. _`Copyright.txt`: Copyright.txt