[PATCH docs] Add doc for contribution guidelines

[Jeremy Kerr]

Hi Sam,

> <snip>
>> +OpenBMC has quite a module structure, consisting of small daemons with a
>> +limited set of responsibilities. These communicate over dbus with other
>> +components, to implement the complete BMC system.
> <snip>
>
> Just a nitpick: should that be s/module/modular?

Yes, it should be. I'll queue this change with any other small fixes 
that come in.

Thanks!



Jeremy