feat: Add hacktoberfest query to the README table content

[tungbq]

Add hacktoberfest query to the README table content:
https://github.com/tungbq/find-github-issue/blob/main/README.md#open-github-issues

• Area: All
• Name: Hacktoberfest
• Link: https://github.com/issues?q=is%3Aopen+is%3Aissue+no%3Aassignee+label%3Ahacktoberfest