STEPS -
1. CREATE AN ANGULAR APP
2. CREATE TWO BUTTONS - LOGIN AND DASHBOARD IN APP.HTML
3. CREATE FUNCTIONS OF BUTTON CLICK IN APP.COMPONENT.TS
4. ADD TWO COMPONENTS - LOGIN AND DASHBOARD
5. ADD ROUTES IN APP-ROUTING.MODULE.TS - IMPORT BOTH COMPONENTS
6. IMPORT ROUTER IN APP.COMPONENT.TS
7. ADD ROUTER-OUTLET - APP.COMPONENT.HTML
8. IMPORT APPROUTINGMODULE IN APP.MODULE.TS