Create pull_request_template.md

Author: kohya-ss

.github/pull_request_template.md

@@ -0,0 +1,11 @@
+## Description
+
+
+
+## License agreement
+
+This repository will be licensed under GNU AFFERO GENERAL PUBLIC LICENSE Version 3 (AGPL).
+https://www.gnu.org/licenses/agpl-3.0.en.html
+
+Please leave the following line to indicate your agreement.
+**I agree to license the code contained in this pull request under GNU AFFERO GENERAL PUBLIC LICENSE Version 3.**