Added basic readme

Author: Jonathan Coveney

README

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+This is a tool that I thought would be useful in the pursuit of tweets, and other endeavours germain to the life of a modern gentleman.
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+The idea is that where Base64 encoding takes an arbitrary byte stream and encodes it 6 bits at a time using 64 characters likely to render on any platform, you can instead encode using more UTF8 characters (in this case, 14 bits worth) in order to make a more compact encoding. Since UTF8 is quite common (on Twitter, for example), this could be a fun win on platforms that support it.
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+Please let me know if there are any issues