add Rio to syscom section (#335)

New syscom member 😎

Reviewed-on: www/www-new#335
Reviewed-by: n3parikh <n3parikh@csclub.uwaterloo.ca>
Co-authored-by: Max Erenberg <merenber@csclub.uwaterloo.ca>
Co-committed-by: Max Erenberg <merenber@csclub.uwaterloo.ca>

content/team/systems-committee.json

@@ -12,6 +12,10 @@
     "name": "Raymond Li",
     "role": "Member"
   },
+  {
+    "name": "Rio Liu",
+    "role": "Member"
+  },
   {
     "name": "Amin Bandali",
     "role": "Member"