Create README.md

Author: nkavokine

README.md

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+[![build](https://github.com/TRIQS/cthyb/workflows/build/badge.svg)](https://github.com/TRIQS/cthyb/actions?query=workflow%3Abuild)
+
+## TRIQS segment picture impurity solver with spin-spin interactions (CTSEG-J)
+
+Copyright (C) 2024, N. Kavokine, H. Lu and O. Parcollet \
+
+### Documentation
+
+For documentation and installation instructions see [triqs.github.io/ctseg-j](https://triqs.github.io/ctseg-j).
+
+### License
+
+This application is free software: you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the Free
+Software Foundation, either version 3 of the License, or (at your option) any
+later version (see http://www.gnu.org/licenses/).
+
+It is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.