add obfs dialer

pkg/dialer/obfs/tls/metadata.go

@@ -0,0 +1,18 @@
+package tls
+
+import (
+	md "github.com/go-gost/gost/pkg/metadata"
+)
+
+type metadata struct {
+	host string
+}
+
+func (d *obfsTLSDialer) parseMetadata(md md.Metadata) (err error) {
+	const (
+		host = "host"
+	)
+
+	d.md.host = md.GetString(host)
+	return
+}