[gnome-tetravex] Add basic readme and code of conduct.

[Arnaud B. <arnaudb src gnome org>]

commit bd922375d93d1a0637fa0e198959d6e0965e52a9
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Fri Sep 27 20:23:42 2019 +0200

    Add basic readme and code of conduct.

 README.md          | 10 ++++++++++
 code-of-conduct.md |  3 +++
 2 files changed, 13 insertions(+)
---
diff --git a/README.md b/README.md
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index 0000000..2f7ddca
--- /dev/null
+++ b/README.md
@@ -0,0 +1,10 @@
+# Tetravex
+
+A tetravex game for GNOME.
+
+## Useful links
+
+- Homepage: <https://wiki.gnome.org/Apps/Tetravex>
+- Report issues: <https://gitlab.gnome.org/GNOME/gnome-tetravex/issues/>
+- Translate: <https://wiki.gnome.org/TranslationProject>
+- Code of Conduct: <https://gitlab.gnome.org/GNOME/gnome-tetravex/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
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+++ 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.