Add in a Committers table. (#4637)

* Add in a Committers table.

Signed-off-by: Chris Lalancette <clalancette@gmail.com>
Co-authored-by: Miguel Company <miguelcompany@eprosima.com>
(cherry picked from commit a020799)

source/The-ROS2-Project/Governance.rst

@@ -96,10 +96,27 @@ The ROS PMC currently consists of the following constituents:
      - Member
      - PST (UTC-8)/PDT (UTC-7)
 
-Past ROS PMC Members
-^^^^^^^^^^^^^^^^^^^^
+Current ROS Committers
+^^^^^^^^^^^^^^^^^^^^^^
 
-The ROS PMC thanks the following past members for their service:
+The ROS committers (who are not also part of the ROS PMC) consists of the following constituents:
+
+.. list-table::
+   :header-rows: 1
+
+   * - Name
+     - Affiliation
+     - GitHub handle
+     - Time Zone (optional)
+   * - Miguel Company
+     - eProsima
+     - MiguelCompany
+     - CET (UTC+1)/CEST (UTC+2)
+
+Past ROS PMC Constituents
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The ROS PMC thanks the following past constituents for their service:
 
 .. list-table::
    :header-rows: 1