Clarify the signed-off-by advice in CONTRIBUTING.md. Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
Add advice on pull requests and best practices in working with Github. Minor corrections & updates. Adjust to Github 'markdown' syntax. Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>