Add Tests for Agent and changed some APIs.

Add unit tests for previously uncovered code.

Fix hang in ResourcePool when canExecute of queued items returned false.

Add ownership model to resource pool.

Improve ResourcePool (Adding new Items)

Add priority search to resource pool.

Add deployment to nuget feed

Add Status Badge

Improve AsyncAutoResetEvent behavior.

Set up CI with Azure Pipelines

Add ResourcePool<T> and AsyncAutoResetEvent Utils

Add automatic generation of release nuget package.

Fixes #1: Failed planning will now return Success=>false and a Plan=>null

Fix typos in README.md

Add section about agents to README.md.