content/groups/systemsoftware.md: Add WG description

Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>

content/groups/systemsoftware.md

@@ -21,6 +21,19 @@ chat:
   mattermost: https://chat.openpower.foundation/opf/channels/systemsoftware
 files: https://files.openpower.foundation/f/475
 kanban: https://kanban.openpower.foundation/b/7ZvTJoH3sFbTF25Gk/system-software
-date: 2021-07-27
+date: 2022-03-08
 draft: false
 ---
+
+The OpenPOWER System Software Technical Workgroup is the workgroup that governs
+over the POWER firmware, software and its specifications.
+
+The OpenPOWER System Software TWG will process proposals, Requests for Change
+(RFCs), review them, and publish approved additions to the POWER software
+specifications.  
+
+The System Software TWG will :
+
+- Process RFCs from both OpenPOWER Foundation members and non-members
+- Review and accept new specifications and their updates including the process
+  of publication