Updated README to let users know to use an encoded password for the curl command. Also fixed typos, rephrased items, made description more concise, and mentioned when and how to include a security token.
Updated README to let users know to use an encoded password for the curl command. Also fixed typos, rephrased items, made description more concise, and mentioned when and how to include a security token.

SharmeelaMST/Research,claudiadelriego/ApexUnit