add post

db/migrate/20220227194054_create_posts.rb

@@ -0,0 +1,11 @@
+class CreatePosts < ActiveRecord::Migration[7.0]
+  def change
+    create_table :posts do |t|
+      t.text :content, null: true
+      t.references :user, null: false, references: :user, foreign_key: { to_table: :users }
+      t.references :quoted_post, null: true, references: :post, foreign_key: { to_table: :posts }
+
+      t.timestamps
+    end
+  end
+end