add Question

db/migrate/20220721124944_create_questions.rb

@@ -0,0 +1,23 @@
+class CreateQuestions < ActiveRecord::Migration[7.0]
+  def change
+    create_table :questions do |t|
+      t.references :user, null: false, foreign_key: true
+      t.references :subject, null: true, foreign_key: true
+      t.jsonb :alternatives, null: false, default: []
+      t.string :authorship
+      t.string :authorship_year
+      t.string :bloom_taxonomy
+      t.text :body
+      t.string :check_type
+      t.string :difficulty
+      t.text :explanation
+      t.text :instruction
+      t.text :intention
+      t.text :references
+      t.string :status, null: false, default: 'draft'
+      t.text :support
+
+      t.timestamps
+    end
+  end
+end