Update CONTRIBUTING.md

Added to Line 8 - Do use Expensify employee or customer accounts for testing

contributingGuides/CONTRIBUTING.md

@@ -5,7 +5,7 @@ Welcome! Thanks for checking out the New Expensify app and taking the time to co
 If you would like to become an Expensify contributor, the first step is to read this document in its **entirety**. The second step is to review the README guidelines [here](https://github.com/Expensify/App/blob/main/README.md) to understand our coding philosophy and for a general overview of the code repository (i.e. how to run the app locally, testing, storage, our app philosophy, etc). Please read both documents before asking questions, as it may be covered within the documentation.
 
 #### Test Accounts
-You can create as many accounts as needed in order to test your changes directly from [the app](https://new.expensify.com/). An initial account can be created when logging in for the first time, and additional accounts can be created by opening the "New Chat" or "Group Chat" pages via the Global Create menu, inputting a valid email or phone number, and tapping the user's avatar.
+You can create as many accounts as needed in order to test your changes directly from [the app](https://new.expensify.com/). An initial account can be created when logging in for the first time, and additional accounts can be created by opening the "New Chat" or "Group Chat" pages via the Global Create menu, inputting a valid email or phone number, and tapping the user's avatar. Do use Expensify employee or customer accounts for testing. 
 
 **Notes**: