add font-awesome-free, add group model

app/components/button/link.hbs

app/components/button/submit.hbs

app/components/button/submit.js

app/components/group/new.hbs

app/components/group/new.js

app/components/group/table_row.hbs

app/components/group/table_row.js

app/components/nav/sidebar.hbs

app/components/tag/table_row.js

app/models/group.js

app/models/tag.js

app/router.js

app/routes/groups.js

app/routes/tags.js

app/templates/groups.hbs

app/templates/tags.hbs

ember-cli-build.js

package-lock.json

package.json

public/api/groups.json