title: How to insert data in database via Notion API?
body: <p>I am really new to Notion, and I want to use the API for a project.</p>
  <p>How I am supposed to insert data in a Notion database ?
  I know how to read information about the database, I know how to update schema, I know how to retrieve data from database, but I do not know how to insert data to or remove data from database.</p>
  <p>THX.</p>