added notes about to use mobservables in typescript
added notes about to use mobservables in typescript

sandals/mobservable,andykog/mobservable,mobxjs/mobx,mweststrate/MOBservable,mobxjs/mobx,sandals/mobservable,romseguy/mobservable,ryanbraganza/MOBservable,romseguy/mobservable,mweststrate/MOBservable,mweststrate/MOBservable,andykog/mobx,andykog/mobx,ryanbraganza/MOBservable,romseguy/mobservable,sandals/mobservable,mobxjs/mobx,dschalk/mobservable,ryanbraganza/MOBservable,andykog/mobservable,dschalk/mobservable,mobxjs/mobx,dschalk/mobservable