add missing chemprop file

LICENSE.txt

@@ -0,0 +1,27 @@
+MIT License
+
+Copyright (c) 2024 The Chemprop Development Team (Regina Barzilay, 
+Jackson Burns, Yunsie Chung, Anna Doner, Xiaorui Dong, David Graff, 
+William Green, Kevin Greenman, Yanfei Guan, Esther Heid, Lior Hirschfeld, 
+Tommi Jaakkola, Wengong Jin, Olivier Lafontant-Joseph, Shih-Cheng Li, 
+Mengjie Liu, Joel Manu, Charles McGill, Angiras Menon, Nathan Morgan, 
+Hao-Wei Pang, Kevin Spiekermann, Kyle Swanson, Allison Tam, 
+Florence Vermeire, Haoyang Wu, and Kevin Yang, Jonathan Zheng)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.