Update README.md

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samples/react-sites-selected-admin/README.md

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 ## Minimal Path to Awesome
 - Add an app in Azure AD, or for an exising app add the Sites.Selected Microsoft Graph api permission
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 ![alt text](./assets/aad-appreg.png "AAD app reg")
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 - Clone this repository
 - Ensure that you are at the solution folder
 - in the command-line run:
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   - **gulp package-solution --ship**
 - Add the .sppkg package to your app catalog
 - Approve the api access requests
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 ![alt text](./assets/api-access-page.png "API Management")
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 - Install webpart on a site of your choice
 - Add permissions to your app
 - Try out the AAD app by sending a request using your favourite method