Added README with some background

README

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+This repo contains the source code of Calendar Cloner and Calendar Cloner FREE, both Android apps that can be found in Google Play.
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+Since the initial release a lot has happened in my personal life. And although I could support the app for a number of years after, that is no longer the case. It is not a lack of interest, but a lack of time. I hope that by releasing the code, someone else can pick up where I left.
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+With regards to the code itself, please be forgiving to what I produced. It works perfectly in many cases, but the code structure can be much improved. This was my first big(ger) Java project so back then I still had a lot to learn.
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+If someone has any questions regarding it, feel free to contact me.
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+And as always, happy cloning.
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+Cheers
+  Jeroen
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