[gnome-2048] Add basic code of conduct.

[Arnaud B. <arnaudb src gnome org>]

commit d658cebc666e9db07485df72ccafada34a8a15d0
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sat Sep 28 00:08:20 2019 +0200

    Add basic code of conduct.

 README.md          | 6 +++---
 code-of-conduct.md | 3 +++
 2 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/README.md b/README.md
index 7e7db5a..d7f3f1e 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
 # GNOME 2048
 
-A 2048 clone for GNOME.
+A 2048-like game for GNOME.
 
 ## Useful links
 
 - Homepage: <https://wiki.gnome.org/Apps/2048>
 - Report issues: <https://gitlab.gnome.org/GNOME/gnome-2048/issues/>
-- Donate: <https://www.gnome.org/friends/>
-- Translate: <https://wiki.gnome.org/TranslationProject>
\ No newline at end of file
+- Translate: <https://wiki.gnome.org/TranslationProject>
+- Code of Conduct: <https://gitlab.gnome.org/GNOME/gnome-2048/blob/master/code-of-conduct.md>
diff --git a/code-of-conduct.md b/code-of-conduct.md
new file mode 100644
index 0000000..7ab9a08
--- /dev/null
+++ b/code-of-conduct.md
@@ -0,0 +1,3 @@
+# Code of Conduct
+
+The web-places where this application is developed –mainly on the GNOME Gitlab instance– try to be welcoming 
spaces. If you feel something is missing for reaching that goal, please open an issue about it or notify it 
to the maintainer. Also, note that the [GNOME Foundation code of 
conduct](https://wiki.gnome.org/Foundation/CodeOfConduct) applies there. Thanks.