Add first admin creation script

db/migrations/003_add_admin_to_members.rb

@@ -0,0 +1,13 @@
+Sequel.migration do
+  up do
+    alter_table(:members) do
+      add_column :admin, TrueClass, null: false, default: false
+    end
+  end
+
+  down do
+    alter_table(:members) do
+      drop_column :admin
+    end
+  end
+end