Added Go implementation of chatroom

TestChatServer/go/README

@@ -0,0 +1,3 @@
+With the latest weekly go:
+
+	go run chatroom.go

TestChatServer/go/chatroom.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+    "code.google.com/p/go.net/websocket"
+    "net/http"
+)
+
+type Msg struct {
+    sender *websocket.Conn
+    msg    string
+}
+
+func run(reg chan *websocket.Conn, unreg chan *websocket.Conn, msg chan Msg) {
+    conns := make(map[*websocket.Conn]int)
+    for {
+        select {
+        case c := <-reg:
+            conns[c] = 1
+        case c := <-unreg:
+            delete(conns, c)
+        case msg := <-msg:
+            for c := range conns {
+                if c != msg.sender {
+                    websocket.Message.Send(c, msg.msg)
+                }
+            }
+        }
+    }
+}
+
+func newChatServer(reg chan *websocket.Conn, unreg chan *websocket.Conn, msg chan Msg) websocket.Handler {
+    return func(ws *websocket.Conn) {
+        reg <- ws
+        for {
+            var message string
+            err := websocket.Message.Receive(ws, &message)
+            if err != nil {
+                unreg <- ws
+                break
+            }
+            msg <- Msg{ws, message}
+        }
+    }
+}
+
+func main() {
+    reg := make(chan *websocket.Conn)
+    unreg := make(chan *websocket.Conn)
+    msg := make(chan Msg)
+
+    http.Handle("/chat", websocket.Handler(newChatServer(reg, unreg, msg)))
+    go run(reg, unreg, msg)
+
+    err := http.ListenAndServe(":9000", nil)
+    if err != nil {
+        panic("ListenAndServe: " + err.Error())
+    }
+}