add assessement endpoint

db/migrate/20230705145916_create_assessments.rb

@@ -0,0 +1,12 @@
+class CreateAssessments < ActiveRecord::Migration[7.0]
+  def change
+    create_table :assessments do |t|
+      t.string :title
+      t.text :observations
+      t.jsonb :params
+      t.references :user, null: false, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end