Update README for gitlab migration

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

README.md

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+X Server
+--------
+
+The X server accepts requests from client applications to create windows,
+which are (normally rectangular) "virtual screens" that the client program
+can draw into.
+
+Windows are then composed on the actual screen by the X server
+(or by a separate composite manager) as directed by the window manager,
+which usually communicates with the user via graphical controls such as buttons
+and draggable titlebars and borders.
+
+For a comprehensive overview of X Server and X Window System, consult the
+following article:
+https://en.wikipedia.org/wiki/X_server
+
+All questions regarding this software should be directed at the
+Xorg mailing list:
+
+  https://lists.freedesktop.org/mailman/listinfo/xorg
+
+The master development code repository can be found at:
+
+  https://gitlab.freedesktop.org/xorg/xserver
+
+For patch submission instructions, see:
+
+  https://www.x.org/wiki/Development/Documentation/SubmittingPatches
+
+As with other projects hosted on freedesktop.org, X.Org follows its
+Code of Conduct, based on the Contributor Covenant. Please conduct
+yourself in a respectful and civilized manner when using the above
+mailing lists, bug trackers, etc:
+
+  https://www.freedesktop.org/wiki/CodeOfConduct