doc: add coding style

Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>

diff --git a/doc/contributions/coding_style.md b/doc/contributions/coding_style.md
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+# Coding style
+
+* For a general guidance refer to the
+[Linux kernel coding style](https://www.kernel.org/doc/html/latest/process/coding-style.html)
+
+* Patches that change the existing coding style are not welcome, as they make
+downstream porting harder for the distributions
+
+## Indentation
+
+Tabs are preferred over spaces for indentation. Loading the `.editorconfig`
+file in your preferred IDE may help you configure it.