Add MIT LICENSE

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2014-2020 Konstantin Taranov
+
+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.

README.md

@@ -62,6 +62,9 @@
  - [Colin Gillespie’s R style guide](http://csgillespie.wordpress.com/2010/11/23/r-style-guide/)
  - [Hadley Wickham’s R style guide](http://stat405.had.co.nz/r-style.html)
 
+## License
+[MIT](/LICENSE)
+
 [1]:https://docs.microsoft.com/en-us/dotnet/standard/design-guidelines/naming-guidelines
 [2]:https://docs.microsoft.com/en-us/dotnet/standard/design-guidelines
 [3]:https://google.github.io/styleguide/Rguide.xml