added liscence and authors

AUTHORS.txt

@@ -0,0 +1,28 @@
+Authors
+=======
+
+cadCAD was originally implemented by Joshua E. Jodesty and designed by Michael Zargham, Markus B. Koch, and
+Matthew Barlin from 2018 to 2019.
+
+Project Maintainers:
+- Joshua E. Jodesty <joshua@block.science, joshua.jodesty@gmail.com>
+- Markus B. Koch <markus@block.science>
+
+Contributors:
+- Joshua E. Jodesty
+- Markus B. Koch
+- Matthew Barlin
+- Michael Zargham
+- Zixuan Zhang
+
+
+
+We’d also like to thank:
+- Andrew Clark
+- Nikhil Jamdade
+- Nick Hirannet
+- Harry Goodnight
+- Charlie Hoppes
+- Jonathan Gabler
+- Charles Rice
+

LICENSE.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018-2019 BlockScience
+
+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.