Added sample for Forem (Independent Publisher) connector

[Laskewitz]

• Bug fix?
• New sample?
• Related issues: fixes #X, partially #Y, mentioned in #Z
• Needs API permissions?
• Has other prerequisites? (E.g. requires a list, document library, etc.)

What's in this Pull Request?

This is a sample which demonstrates the use of the Forem (Independent Publisher) connector.

Checklist

• My pull request affects only ONE sample.
• I have updated the README file.
• My README has at least one static high-resolution screenshot (i.e. not a GIF)
• My README contains complete setup instructions, including pre-requisites and permissions required

[Katerina-Chernevskaya]

Hi @Laskewitz ,

Just swooping in here - I saw you requested for another reviewer, but why wait? I went ahead, reviewed and I'm going to merge your sample! 😀

Thank you for your contribution!