added p2p module code base code

p2p/upnp.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+  "fmt"
+	"log"
+	"gitlab.com/NebulousLabs/go-upnp"
+)
+
+func main() {
+    // connect to router
+    d, err := upnp.Discover()
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    // discover external IP
+    ip, err := d.ExternalIP()
+    if err != nil {
+        log.Fatal(err)
+    }
+    fmt.Println("Your external IP is:", ip)
+
+    // forward a port
+  /*   err = d.Forward(63390, "upnp test")
+    if err != nil {
+        log.Fatal(err)
+    } */
+
+    // un-forward a port
+    err = d.Clear(63390)
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    // record router's location
+    loc := d.Location()
+
+    // connect to router directly
+    d, err = upnp.Load(loc)
+    if err != nil {
+        log.Fatal(err)
+    }
+}