Compiles for both Main files + documentation on repo's frontpage.

[pkok]

Both Main files did not compile, for different reasons:

• NAOH21/Main.cpp did not compile, because WRIST_YAW was used, while commented in its robotConsts.h;
• NAOH25/Main.cpp did not compile, because robotConsts.h was lacking. I uncommented the WRIST_YAW and HAND enum values.