fix(docs): add configuration file for readthedocs

The Read the Docs build system will now require a configuration file
v2 (.readthedocs.yaml)

Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
Change-Id: Ifa3b7e132b8295663adf3e3c7877166fdf76924f
1 file changed