리드미 추가

readme-en.md

@@ -38,3 +38,5 @@ openNAMU is protected by [BSD 3-Clause License](./LICNESE). Please refer to the
  * Owner rights are granted to the first registor.
  * [Test Server](http://2du.pythonanywhere.com)
  * [Contributors](https://github.com/openNAMU/openNAMU/graphs/contributors)
+ * [Old History 1](https://github.com/openNAMU/openNAMU-Backup)
+ * [Old History 2](https://github.com/openNAMU/Discard-openNAMU-Legacy)

readme.md

@@ -48,3 +48,5 @@
  * 첫 가입자에게 소유자 권한이 부여됩니다.
  * [테스트 서버](http://2du.pythonanywhere.com)
  * [기여자 목록](https://github.com/openNAMU/openNAMU/graphs/contributors)
+ * [예전 히스토리 1](https://github.com/openNAMU/openNAMU-Backup)
+ * [예전 히스토리 2](https://github.com/openNAMU/Discard-openNAMU-Legacy)