[librsvg] Add a CONTRIBUTING.md in preparation for gitlab.gnome.org

[Federico Mena Quintero <federico src gnome org>]

commit a7e1953a343459762f362a069b6024567c8dda06
Author: Federico Mena Quintero <federico gnome org>
Date:   Mon Jun 26 21:01:28 2017 -0500

    Add a CONTRIBUTING.md in preparation for gitlab.gnome.org

 CONTRIBUTING.md |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 README          |   14 +--------
 2 files changed, 79 insertions(+), 12 deletions(-)
---
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..c625e64
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,77 @@
+Contributing to librsvg
+=======================
+
+Thank you for looking in this file!  There are different ways of
+contributing to librsvg, and we appreciate all of them.
+
+* [Source repository](#source-code)
+* [Reporting bugs](#reporting-bugs)
+* [Feature requests](#feature-requests)
+* [Pull requests](#pull-requests)
+
+There is a code of conduct for contributors to librsvg; please see the
+file `code_of_conduct.md`.
+
+## Source repository
+
+Librsvg's main source repository is at git.gnome.org.  You can view
+the web interface here:
+
+https://git.gnome.org/browse/librsvg/
+
+Development happens in the master branch.  There are also branches for
+stable releases.
+
+Alternatively, you can use the mirror at Github:
+
+https://github.com/GNOME/librsvg
+
+Note that we don't do bug tracking in the Github mirror; see the next
+section.
+
+## Reporting bugs
+
+Please report bugs at http://bugzilla.gnome.org/enter_bug.cgi?product=librsvg
+
+If you want to report a rendering bug, or a missing SVG feature,
+please provide an example SVG file as an attachment to your bug
+report.  It really helps if you can minimize the SVG to only the
+elements required to reproduce the bug or see the missing feature, but
+it is not absolutely required.  Please be careful of publishing SVG
+images that you don't want other people to see; the bug tracker is a
+public resource and attachments are visible to everyone.
+
+## Feature requests
+
+Librsvg aims to be a small and relatively simple SVG rendering
+library.  Currently we do not plan to support scripting, animation, or
+interactive features like mouse events on SVG elements.
+
+However, we *do* aim go provide good support for SVG's graphical
+features.  Please see the "[reporting bugs](#reporting-bugs)" section for
+information about our bug tracking system; feature requests should be
+directed there.
+
+It is especially helpful if you file bug for a feature request along
+with a sample SVG file.
+
+## Pull requests
+
+You may upload a forked version of librsvg
+to [GNOME's Gitlab instance][gitlab], and create a pull request there.
+
+Although all of `git.gnome.org`'s modules are mirrored at Github, we
+don't support pull requests from there.  Apologies for the
+inconvenience - we do this to promote the use of free software,
+including web-based services.  Please use [GNOME's Gitlab][gitlab] instead.
+
+Please make sure that the test suite passes with the changes in your
+branch.  The easiest way to run all the tests is to go to librsvg's
+toplevel directory and run `make check`.  This will run both the small
+unit tests and the black box tests in the `librsvg/tests` directory.
+
+If you need to add new tests (you should, for new features, or for
+things that we weren't testing!), or for additional information on how
+the test suite works, please see the file `tests/README.md`.
+
+[gitlab](https://gitlab.gnome.org/)
diff --git a/README b/README
index 073b2ed..7b1af16 100644
--- a/README
+++ b/README
@@ -10,18 +10,8 @@ minimal, no-nonsense API?  Librsvg may be adequate for you.
 There is a code of conduct for contributors to librsvg; please see the
 file code_of_conduct.md.
 
-Reporting bugs
---------------
-
-Please report bugs at http://bugzilla.gnome.org/enter_bug.cgi?product=librsvg
-
-If you want to report a rendering bug, or a missing SVG feature,
-please provide an example SVG file as an attachment to your bug
-report.  It really helps if you can minimize the SVG to only the
-elements required to reproduce the bug or see the missing feature, but
-it is not absolutely required.  Please be careful of publishing SVG
-images that you don't want other people to see; the bug tracker is a
-public resource and attachments are visible to everyone.
+For information on how to report bugs, or how to contribute to librsvg
+in general, please see the file CONTRIBUTING.md.
 
 Goals of librsvg
 ----------------