Add Social Proof Examples

[slowbaker]

Pull Request Template

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

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