Convert README to markdown

And update it a little for the current Gitlab infrastructure.

README

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-xf86-video-amdgpu - AMD Radeon video driver for the Xorg X server
-
-Patches and questions regarding this software should be directed at the
-amd-gfx mailing list:
-
-        https://lists.freedesktop.org/mailman/listinfo/amd-gfx
-
-Please submit bug reports to the Xorg bugzilla:
-
-        https://bugs.freedesktop.org/enter_bug.cgi?product=xorg&component=Driver/AMDgpu
-
-The master development code repository can be found at:
-
-        git://anongit.freedesktop.org/git/xorg/driver/xf86-video-amdgpu
-
-        https://cgit.freedesktop.org/xorg/driver/xf86-video-amdgpu
-
-For patch submission instructions, see:
-
-        https://www.x.org/wiki/Development/Documentation/SubmittingPatches
-
-For more information on the git code manager, see:
-
-        https://wiki.x.org/wiki/GitPage
-

README.md

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+xf86-video-amdgpu - Xorg driver for AMD Radeon GPUs using the amdgpu kernel driver
+==================================================================================
+
+Questions regarding this software should be directed at the
+[amd-gfx mailing list](https://lists.freedesktop.org/mailman/listinfo/amd-gfx).
+
+Please
+[submit bug reports](https://bugs.freedesktop.org/enter_bug.cgi?product=xorg&component=Driver/AMDgpu)
+to the Xorg bugzilla.
+
+The
+[master development code repository](https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu)
+can be found at FreeDesktop Gitlab.
+
+Please use merge requests for patch submission.
+
+See the X.org wiki for
+[further patch submission instructions](https://www.x.org/wiki/Development/Documentation/SubmittingPatches)
+and
+[more information on the git code manager](https://wiki.x.org/wiki/GitPage).
+