Add REUSE badge in README

Author: flashcode

README.md

@@ -1,6 +1,7 @@
 # WeeChat official scripts
 
 [![CI Status](https://github.com/weechat/scripts/workflows/CI/badge.svg)](https://github.com/weechat/scripts/actions?query=workflow%3A%22CI%22)
+[![REUSE status](https://api.reuse.software/badge/github.com/weechat/scripts)](https://api.reuse.software/info/github.com/weechat/scripts)
 
 These official scripts can be installed with command `/script install <name>` in WeeChat.