Readme.md update

~ Todo & already done are now called todo only x = already done / [ ] not done 
~ some typos/spelling problems fixed
~ Acknowledgements changed -> missing and important projects added (like busybox, iptables,...) alphabetically order
+ added translating info
~ updated NDK it's now 10 (which of course works with older versions) [GCC is now 4.7 stable]