add validation to summary
- [Getting Started](getting-started/overview.md)
- [Creating A Load test](getting-started/creating.md)
+ - [Validating requests](getting-started/validation.md)
- [Running A Load Test](getting-started/running.md)
- [Run-Time Options](getting-started/runtime-options.md)
- [Common Options](getting-started/common.md)
