Added trade unions

Server/db/migrations/2_create_table_roles.jl

@@ -0,0 +1,20 @@
+module CreateTableRoles
+
+import SearchLight.Migrations: create_table, column, primary_key, add_index, drop_table
+
+function up()
+    create_table(:roles) do
+    [
+        primary_key()
+        column(:name, :string, limit = 100)
+    ]
+    end
+
+    add_index(:roles, :name)
+end
+
+function down()
+    drop_table(:roles)
+end
+
+end