Add Activity_cards

angular.json

package-lock.json

package.json

src/app/activity-cards/activity-cards.component.css

src/app/activity-cards/activity-cards.component.html

src/app/activity-cards/activity-cards.component.spec.ts

src/app/activity-cards/activity-cards.component.ts

src/app/activity-context.directive.spec.ts

src/app/activity-context.directive.ts

src/app/app.component.html

src/app/app.module.ts

src/assets/images/afterwork.png

src/assets/images/conference.png

src/assets/images/sport.png

src/index.html