add license to project

This adds the MIT copyright license to the project to make it easier
for other people to re-use. The other clones of the original zxcvbn
also seem to be doing the same thing.

This is the only identifying information I have on the author, not sure
if that's enough for you?:

    tsyrogit https://github.com/tsyrogit

1 files changed, 22 insertions, 0 deletions

diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..caa5846
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,22 @@
+The MIT License
+
+Copyright (c) 2015-2017 tsyrogit https://github.com/tsyrogit
+
+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.
+