Adding new sample 'approval-reminders'

[stevecorey365]

We're so eager to add your sample to this repository as soon as possible, but we need all samples follow the same structure.
To make sure we process it as soon as possible, make sure to follow these instructions.

Q	A
Bug fix?	no
New feature?	no
New sample?	yes
Related issues?	no

Solution Details

Q	A
Solution requires premium license	no
Which connectors are used?	SharePoint, Teams, Outlook,Approvals
Solution uses on-premises connectors?	no
Solution uses custom connectors?	no

What's in this Pull Request?

This sample sends an approval and reminders to a user via Teams until they respond to the approval. It will retrigger itself as needed to overcome timeout limitations.