Replace README.rst with README.md

Change-Id: I3758edd4d488f24ba60b07ef019b175d78190592

README.md

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+Ceres Solver - A non-linear least squares minimizer
+===================================================
+
+Please see [ceres-solver.org](http://ceres-solver.org/) for more
+information.
+
+WARNING - Do not make GitHub pull requests!
+-------------------------------------------
+
+Ceres development happens on
+[Gerrit](https://ceres-solver.googlesource.com/), including both
+repository hosting and code reviews. The GitHub Repository is a
+continuously updated mirror which is primarily meant for issue
+tracking. Please see our [Contributing to Ceres Guide](http://ceres-solver.org/contributing.html) for more details.
+
+The upstream Gerrit repository is
+
+    https://ceres-solver.googlesource.com/ceres-solver

README.rst

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-Ceres Solver - A non-linear least squares minimizer
-===================================================
-Please see `ceres-solver.org <http://ceres-solver.org/>`_ for more information.
-
-WARNING - Do not make GitHub pull requests!
--------------------------------------------
-
-Ceres development happens on `Gerrit
-<https://ceres-solver.googlesource.com/>`_, including both repository
-hosting and code reviews. The GitHub Repository is a continuously
-updated mirror which is primarily meant for issue tracking. Please see
-our `contributing guide <http://ceres-solver.org/contributing.html>`_
-for more details.
-
-The upstream Gerrit repository is::
-
-  https://ceres-solver.googlesource.com/ceres-solver