mention the integrator certification

This was raised by @toothstone in #1005. Thanks!

Signed-off-by: Felix Kronlage-Dammers <fkr@hazardous.org>

Author: fkr

standards/certification/scopes-versions.md

@@ -1,6 +1,8 @@
 # Scopes and versions
 
-SCS provides a certification framework consisting of six different kinds of certificates of varying scope.
+## Infrastructure Offerings
+
+For infrastructure offerings SCS provides a certification framework consisting of six different kinds of certificates of varying scope.
 These scopes can be sorted into two dimensions:
 
 1. _certification level_, of which there are three:
@@ -15,4 +17,12 @@ So, for instance, a certificate can have the scope _SCS-compatible IaaS_ or _SCS
 
 Each scope corresponds to a set of standards. As these standards progress, so do the scopes, and we keep track of this by versioning. Each version undergoes a lifecycle of Draft, Stable, and Deprecated, and we aim to keep at most one version stable at the same time, with the exception of a transition period of 4 to 6 weeks.
 
+The standard [SCS-0004](https://docs.scs.community/standards/global/scs-0004) describes the certification of infrastructure offerings in depth.
+
 ![Alt text](image.png)
+
+## Certification of Integrators
+
+For Integrators and Service Companies the existing framework for infrastructure offerings is used to do a competence and quality assesment.
+Integrators can currently be certified in the _SCS-compatible IaaS_ scope.
+The standard [SCS-0007](https://docs.scs.community/standards/global/scs-0007) describes the Integrator certification in depth.