Documentation: start documenting our services

Change-Id: I4d687d13e8d47e3e3e6f319b9117d3c4f31caa78
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35805
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

Documentation/index.md

@@ -166,6 +166,7 @@ Contents:
 * [Project Ideas](contributing/project_ideas.md)
 * [Code of Conduct](community/code_of_conduct.md)
 * [Community forums](community/forums.md)
+* [Project services](community/services.md)
 * [coreboot at conferences](community/conferences.md)
 * [Payloads](payloads.md)
 * [Distributions](distributions.md)