Add SerpApi

[hilmanski]

SerpApi provides a simple API to access many search engines.

Pull Request Template

Please ensure all items below are checked before creating a pull request:

• [X] My changes were made in the resources folder, not in the auto-generated README.md file or db folder
• [X] My submission is formatted according to the guidelines in the contributing guide
• [X] My submission is ordered alphabetically based on the resource name
• [X] My submission has a useful description
• [X] I have searched the repository for any relevant issues or pull requests