added first draft of Exercise.js
added first draft of Exercise.js


Former-commit-id: a72e69ddc99075f39088e58673ea103accea2a2b
vronvali/iLanguage,vronvali/iLanguage,cesine/iLanguage,iLanguage/iLanguage,iLanguage/iLanguage,vronvali/iLanguage,iLanguage/iLanguage,iLanguage/iLanguage,iLanguage/iLanguage,cesine/iLanguage,vronvali/iLanguage,cesine/iLanguage,cesine/iLanguage,cesine/iLanguage,vronvali/iLanguage,vronvali/iLanguage