[tomboy] Added contribution guidelines to the repo

[Alex Tereschenko <alexter src gnome org>]

commit fce9df50c7dcab999609e60433b8bff7eb8388d6
Author: Alex Tereschenko <frozen and blue gmail com>
Date:   Tue Sep 6 20:27:44 2016 +0200

    Added contribution guidelines to the repo

 CONTRIBUTING |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
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diff --git a/CONTRIBUTING b/CONTRIBUTING
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+Tomboy project welcomes contributions, any of them: code, documentation, bug reports :)
+
+To make it easier to contribute code, we've created instructions on our wiki,
+see them here: https://wiki.gnome.org/Apps/Tomboy/HowToSubmitPatches.
+
+See also other pages on our wiki, it contains a lot of useful information for developers.
+Check it out here: https://wiki.gnome.org/Apps/Tomboy/