Added Interconnect Workgroup (#144)

workgroups/interconnect.md

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+---
+title: Interconnect Workgroup
+leader: Seung-Jun Cha (@seungjunn)
+website:
+mailing_list:  
+meeting_dates: Every month, on the last Friday at 9:30 AM. PT
+meeting_link: "https://meet.google.com/vbx-twec-hpx"
+---
+
+The Interconnect workgroup researches open networking protocols to facilitate direct coherency messaging between components such as processor caches, memory controllers, and various accelerators in RISC-V cores. The interconnections provided by this group play a crucial role in SoCs, chiplets, and various hardware designs. We offer design guidelines for interconnects and manage open-source interconnect IP based on these guidelines. Interconnect WG supports the advancement of the open-source hardware ecosystem.