[fractal] Restore CoC section and fix a typo, in the README

[Christopher Davis <christopherdavis src gnome org>]

commit f4852a6d8a73ad0c7572c174748bee8ff4b6d782
Author: Thibault Martin <mail thibaultmart in>
Date:   Wed Feb 17 11:27:19 2021 +0100

    Restore CoC section and fix a typo, in the README

 README.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 98032843..e02812a3 100644
--- a/README.md
+++ b/README.md
@@ -129,7 +129,7 @@ Full reference in: <https://matrix.org/docs/spec/client_server/r0.2.0.html#m-roo
 Fractal does not currently have encryption support, but
 there is an initiative for it.
 
-We are now partially using using matrix-rust-sdk rather than our own implementation. (See 
https://gitlab.gnome.org/GNOME/fractal/-/issues/636) and are working towards using it completely.
+We are now partially using matrix-rust-sdk rather than our own implementation. (See 
https://gitlab.gnome.org/GNOME/fractal/-/issues/636) and are working towards using it completely.
 
 Code and further information for this module can be found at 
[matrix/matrix-rust-sdk](https://github.com/matrix-org/matrix-rust-sdk).
 
@@ -140,3 +140,7 @@ GNOME application, and accordingly adheres GNOME
 guidelines and paradigms. This will be revisited if or
 when GNOME gets a "Do Not Disturb" feature.
 
+## Code of Conduct
+
+Fractal follows the official GNOME Foundation code of conduct. You can read it [here](/code-of-conduct.md).
+