Add missed copyright and licensing information

tanghaowillow · stv0g · commit ac6517ee51de · 2023-08-08T09:46:24.000+02:00
diff --git a/fuzz_test.go b/fuzz_test.go
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
 package sdp
 
 import "testing"
