add an intro text for accelerator twg

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

content/groups/accelerator.md

@@ -25,3 +25,9 @@ irc: '#openpower-accelerator on irc.libera.chat'
 date: 2021-12-28
 draft: false
 ---
+
+The Accelerator Technical Working Group will be a persistent, standing group that defines, documents, manages, and maintains standards
+which define the interfaces between the processor and accelerator devices and their associated development tools.
+This includes hardware, firmware and any other software require for accelerators to operate within OpenPOWER compliant systems.
+It will also identify future requirements and propose innovations to the interfaces to enable advances in accelerator capabilities and
+work with other working groups as appropriate.