Create LICENSE.txt

LICENSE.txt

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+==========================================================================
+Copyright License
+==========================================================================
+The PKE software is:
+
+Copyright (c) 2021, Zhiyuan Shao (zyshao@hust.edu.cn), 
+                    Yi Gui (gy163email@163.com), 
+                    Yan Jiao (773709579@qq.com),
+                    Ziming Yuan (1223962053@qq.com),
+                    Yixin Song (yixinsong@hust.edu.cn),
+                    Boyang Li (liboyang_hust@163.com),
+                   Huazhong University of Science and Technology
+
+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.
+
+* Neither the name of the Huazhong University of Science and Technology
+  nor the names of its contributors may be used to endorse or promote 
+  products derived from this software without specific prior written 
+  permission.
+
+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.