Updated Read me with license

Yes ! MDroid is now licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported license
Update README.md
Updated to V3.0 Beta

Change log:

V3.0 Beta
-Added in-app change log
-Updated app logo to match with playstore icon
-Major changes in 'about' section

V2.9 Beta
-Select-able text in forums
Removed keystores

They are not required for your development anyway. That's just my
playstore thingy.
Added license file

Yeah I know this licensing thing, I took a bit seriously. Can't help it
because I'm a narcissist :P