Update README.md (#637)

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its purpose, new behaviors after the change. And let us know here if you
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## Description

<!-- A few words to explain your changes -->
Update the readme to reflect clarity changes.

### Linked GitHub issue ID: #  

## Pull Request Checklist
<!-- Put an x in the boxes that apply. This is simply a reminder of what
we are going to look for before merging your code. -->

- [ ] Tests for the changes have been added (for bug fixes / features)
- [x] Code compiles correctly with all tests are passed.
- [ ] I've read the [contributing
guide](https://github.com/microsoft/HydraLab/blob/main/CONTRIBUTING.md#making-changes-to-the-code)
and followed the recommended practices.
- [x] [Wikis](https://github.com/microsoft/HydraLab/wiki) or
[README](https://github.com/microsoft/HydraLab/blob/main/README.md) have
been reviewed and added / updated if needed (for bug fixes / features)

### Does this introduce a breaking change?
*If this introduces a breaking change for Hydra Lab users, please
describe the impact and migration path.*

- [ ] Yes
- [x] No

## How you tested it
*Please make sure the change is tested, you can test it by adding UTs,
do local test and share the screenshots, etc.*


Please check the type of change your PR introduces:
- [ ] Bugfix
- [ ] Feature
- [ ] Technical design
- [ ] Build related changes
- [ ] Refactoring (no functional changes, no api changes)
- [ ] Code style update (formatting, renaming) or Documentation content
changes
- [x] Other (please describe): 

### Feature UI screenshots or Technical design diagrams
*If this is a relatively large or complex change, kick it off by drawing
the tech design with PlantUML and explaining why you chose the solution
you did and what alternatives you considered, etc...*

README.md

@@ -170,3 +170,11 @@ The entire codebase is under [MIT license](https://github.com/microsoft/HydraLab
 
 This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft trademarks or logos is subject to and must follow [Microsoft’s Trademark & Brand Guidelines](https://www.microsoft.com/en-us/legal/intellectualproperty/trademarks/usage/general). Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship. Any use of third-party trademarks or logos are subject to those third-party’s policies.
 
+We use the Microsoft Clarity Analysis Platform for front end client data dashboard, please refer to [Clarity Overview](https://learn.microsoft.com/en-us/clarity/setup-and-installation/about-clarity) and https://clarity.microsoft.com/ to learn more.
+
+Instructions to turn off the Clarity:
+
+Open [MainActivity](https://github.com/microsoft/HydraLab/blob/main/android_client/app/src/main/java/com/microsoft/hydralab/android/client/MainActivity.java), comment the line which call the initClarity(), and rebuild the Hydra Lab Client apk, repalce the one in the agent resources folder.
+
+[Telemetry/data collection notice](https://docs.opensource.microsoft.com/releasing/general-guidance/telemetry)
+