Add view for StudyGroups

app/views/study_groups/show.html.slim

@@ -0,0 +1,21 @@
+h1
+  = @study_group
+  - if policy(@study_group).edit?
+    = render('shared/edit_button', object: @study_group)
+
+= row(label: 'study_group.name', value: @study_group.name)
+= row(label: 'study_group.external_id') do
+  code = @study_group.external_id
+= row(label: 'study_group.consumer', value: link_to_if(policy(@study_group).show?, @study_group.consumer, @study_group.consumer))
+= row(label: 'study_group.member_count', value: @study_group.users.count)
+
+
+h2.mt-4 = t('activerecord.attributes.study_group.members')
+.table-responsive
+  table.table
+    thead
+      tr
+        th = sort_link(@search, :name, t('navigation.sections.users'))
+    - @study_group.users.each do |user|
+      tr
+        td = link_to_if(policy(user).show?, user.displayname, user)