To add to an existing project, run the following command when inside the root directory of the project:
cordova plugin add https://github.com/nixplay/crypto.git
Crypto.md5(`filePath`,` hashSuccess`, `hashError`);
filePath is the path of the file,
hashSuccess is the callback function that needs to be called when the method runs successfully and
hashError is the method to run in case of error.
hashSuccess function will be passed a parameter which is the md5 of the file.