Add community managers to the project members page.

List the community managers for the 2019 term.

Change-Id: I0fe36b8b25cae6637657b204e2036e80debf9592
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+## Community Managers
+
+Gerrit community managers act as stakeholders for the Gerrit community
+and focus on the health of the community. For details about the role of
+community managers, refer to the
+[description here](https://gerrit-review.googlesource.com/Documentation/dev-roles.html#community-manager).
+
+Community Managers for the 2019 term are:
+
+| Name                  | Affiliation            |
+|-----------------------|------------------------|
+| Edwin Kempin          | Google                 |
+| Marco Miller          | Ericsson               |
+| Matthias Sohn         | SAP                    |
+
+
 ## Engineering Steering Committee
 
 The Gerrit project has an Engineering Steering Committee (ESC) that