Add link to Github pages documentation

The link contains a documentation for all certified, marketplace and
community operators.

Signed-off-by: Ales Raszka <[email protected]>

Author: Allda

README.md

@@ -1,6 +1,10 @@
 # Red Hat Marketplace operators production catalog
 Production catalog for Red Hat Marketplace Operator Bundles.
 
+See our [documentation](https://redhat-openshift-ecosystem.github.io/operator-pipelines/) to
+find out more about Marketplace operators and contribution.
+
+
 # Operator bundle submission
 A new operator bundle submission needs to follow a predefined directory
 structure that is described below in this section. The new submission is