Add go installable cmd/caddy

Author: sergeyfrolov

cmd/caddy/caddy.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"github.com/mholt/caddy/caddy/caddymain"
+
+	_ "github.com/caddyserver/forwardproxy"
+)
+
+func main() {
+	caddymain.EnableTelemetry = false
+	caddymain.Run()
+}