examples: add classic network snake test example

Adding this example to test multiple concurrent socket connections.

examples/net/snake/server/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"io"
+	"log"
+	"net"
+)
+
+func main() {
+	// Listen for connections
+	l, err := net.Listen("tcp", ":8080")
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+	defer l.Close()
+	println("Listening on port", ":8080")
+	for {
+		// Wait for a connection
+		conn, err := l.Accept()
+		if err != nil {
+			log.Fatal(err)
+		}
+		println("Accepted connection from", conn.RemoteAddr().String())
+		// Service the new connection in a goroutine.
+		// The loop then returns to accepting, so that
+		// multiple connections may be served concurrently
+		go func(c net.Conn) {
+			// Echo all incoming data
+			io.Copy(c, c)
+			// Shut down the connection
+			c.Close()
+		}(conn)
+	}
+}