Adds working sidenav for add course to plan

package.json

src/app/app.component.html

src/app/app.component.scss

src/app/app.component.ts

src/app/app.module.ts

src/app/core/service/sidenav.service.ts

src/app/degree-planner/degree-planner.component.html

...gree-planner/term-container/term-container.component.html

...degree-planner/term-container/term-container.component.ts