docs(rfd): Add v2 Draft folder (#1130)

Author: benbrandt

docs/docs.json

@@ -130,7 +130,14 @@
               "rfds/next-edit-suggestions",
               "rfds/additional-directories",
               "rfds/custom-llm-endpoint",
-              "rfds/streamable-http-websocket-transport"
+              "rfds/streamable-http-websocket-transport",
+              {
+                "group": "v2 Draft",
+                "expanded": true,
+                "root": "rfds/v2/overview",
+                "directory": "accordion",
+                "pages": ["rfds/v2/prompt"]
+              }
             ]
           },
           {

docs/rfds/v2/overview.md

@@ -0,0 +1,5 @@
+---
+title: "ACP v2 Proposal"
+---
+
+A collection of RFDs that require breaking changes to the protocol and should make up ACP v2.