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, 7 insertions, 1 deletions

diff --git a/README.md b/README.md
index 8403d8a..4b3e9f8 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ version when there are 4 or less parts, but will differ significantly when there
 parts (which is likely to be a rare occurrence).
 
 
-##References
+## References
 
 The original coffee-script version is available at 
  https://github.com/lowe/zxcvbn
@@ -84,3 +84,9 @@ Dictionary trie encoding (used for by the word lookup code) based on idea from t
 Word Graph from
 http://www.pathcom.com/~vadco/cwg.html
 
+## License
+
+MIT License
+
+* http://www.opensource.org/licenses/mit-license.php
+