[PATCH docs v6] Add Gerrit server info to contributing doc

[OpenBMC Patches]

Add steps to setup and push changes to the openbmc gerrit server.

Signed-off-by: Adriana Kobylak <anoo at us.ibm.com>

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/openbmc/docs/30)
<!-- Reviewable:end -->


https://github.com/openbmc/docs/pull/30

Adriana Kobylak (1):
  Add Gerrit server info to contributing doc

 contributing.md | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 50 insertions(+), 4 deletions(-)

-- 
2.9.0