Update Readme.md

+ added Translations section 
~ changed outdated NDK to latest (10), same with GCC [they are both backwards compatible]
~ smaller changes like typos and spelling
~ added missing projects alphabetically under Acknowledgements
~ Todo list updated and now it's a already done and todo list  -> x = already done [ ] todo (better look I think)

@ukanth please also update the readme's in the donate/master branches (thanks)