Create README.md

Author: betarixm

README.md

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+# plt
+[![PLUS@POSTECH](https://img.shields.io/badge/PLUS-POSTECH-000000)](https://plus.or.kr)
+
+PLUS Lab for Training, Web Attack-and-Defense Platform for POSTECH Hacking Camp.
+
+Users can practice XSS, SQL injetion, and SSTI by attacking each other as a team.