Update Coding rules

guidelines/Coding-rules.md

+**This page gives rules and/or guidances to all
+developers that want to integrate some code to Jami **
+
+C++ format rules are defined by this clang-format file:
+https://git.jami.net/savoirfairelinux/ring-daemon/blob/master/.clang-format
+
+All developers are recommended to format their code using the script in `jami-project/format.sh`.
+This is done automatically (as a pre-commit hook) when using `./make-ring.py --init`
\ No newline at end of file

guidelines/Libring-coding-rules.md

-**This page gives rules and/or guidances to all
-developers that want to integrate some code to the LibRing (the Ring
-daemon).**
-
--   Following rules apply to this sub-project only. Others may re-use
-    this one in parts or whole, have their own, etc. Refer to their
-    pages for that.
-
-<!-- -->
-
--   Some rules are _strict_ and are **strongly marked** or using
-    modals like SHALL or MUST.
-
-**!!!Not respecting these rules results in code-review rejection!!!**
-
--   Some are guidance or recommendation (using modals like SHOULD or
-    RECOMMEND), it's up to the developer to balance them with his own
-    way to write code.
-
-<!-- -->
-
--   Rules are defined by this clang-format file:
-https://git.jami.net/savoirfairelinux/ring-daemon/blob/master/.clang-format