add hardware architecture twg and derek wg chair

Signed-off-by: Toshaan Bharvani <toshaan@vantosh.com>

content/groups/hardwarearchitecture.md

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+---
+title: "Hardware Architecture TWG"
+wgtype: twg
+chair:
+  - derekwilliams
+members:
+participation: "Members"
+#git: https://git.openpower.foundation/librebmc/
+#discussion: https://discuss.openpower.foundation/c/sig/librebmc/
+#calendar: 
+#  web: https://discuss.openpower.foundation/c/sig/librebmc/11/l/calendar
+#  ics: webcal://discuss.openpower.foundation/c/sig/librebmc/l/calendar.ics
+#chat:
+#  mattermost: https://chat.openpower.foundation/opf/channels/librebmc
+#  slack: https://app.slack.com/client/T443QD9JA/C01UVKFKUQY
+#  irc: "#librebmc on irc.libera.chat"
+#files: https://files.openpower.foundation/s/iZRseq3XLtRcjtX
+#kanban: https://kanban.openpower.foundation/b/hgDqwnbiZDHFR3B3b/librebmc
+date: 2021-09-25
+draft: false
+---
+
+This workgroup provides a forum for workgroup (WG) members to propose, discuss, and
+approve modifications to the OpenPOWER System Hardware Architecture Specifications.
+The scope of modifications will be focused on the needs of the OpenPOWER ecosystem.  
+

content/persons/derekwilliams.md

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+---
+title: "Derek Williams"
+image:
+member: ibm
+date: 2021-09-25
+draft: false
+---