Add a development guide for measuring performance of node components.
The purpose of this guide is threefold:
1. Document the nuances of measuring kubelet performance so we don't
forget or need to reinvent the wheel.
2. Make it easier for new contributors to analyze performance.
3. Share tips and tricks that current team members might not be aware
of.
joe2far
David McMahon
Dawn Chen
Mike Brown
Tim St. Clair