Add view for StudyGroups

app/views/study_groups/_form.html.slim

@@ -0,0 +1,19 @@
+= form_for(@study_group) do |f|
+  = render('shared/form_errors', object: @study_group)
+  .form-group
+    = f.label(:name)
+    = f.text_field(:name, class: 'form-control', required: true)
+
+  h3 = t('activerecord.attributes.study_group.members')
+  .table-responsive
+    table.table
+      thead
+        tr
+          th = t('activerecord.attributes.exercise.selection')
+          th = sort_link(@search, :name, t('navigation.sections.users'))
+      = collection_check_boxes :study_group, :study_group_membership_ids, @members, :id, :id do |b|
+        tr
+          td = b.check_box
+          td = link_to_if(policy(b.object.user).show?, b.object.user.displayname, b.object.user)
+
+  .actions = render('shared/submit_button', f: f, object: @study_group)