add info on two more nabl2 api strategies
add info on two more nabl2 api strategies

TUDelft-IN4303-2016/TUDelft-IN4303-2016.github.io,TUDelft-IN4303-2016/TUDelft-IN4303-2016.github.io,TUDelft-IN4303-2016/TUDelft-IN4303-2016.github.io