user modules + v install from vpm

tools/vget.v

@@ -0,0 +1,33 @@
+module main
+
+import (
+	http 
+	os 
+	json
+) 
+
+const (
+	//url = 'http://localhost:8089' 
+	url = 'http://vpm.vlang.io' 
+) 
+
+struct Mod {
+	id int 
+	name string 
+	url string
+	nr_downloads int 
+}
+
+fn main() {
+	if os.args.len != 2 {
+		println('usage: vget [module]') 
+		return 
+	} 
+	name := os.args.last() 
+	s := http.get_text(url + '/jsmod/$name') 
+	mod := json.decode(Mod, s) or { return } 
+	home := os.home_dir() 
+	os.exec('git -C "$home/.vmodules" clone $mod.url') 
+	println(s) 
+} 
+