Prerequisites documentation missing

Brief description of your issue

Please add documentation into Readme.md in the root directory and describe what needs to installed/executed in order to be able to build the solution.

So far I've identified the need to execute following:

vcpkg install vcpkg install jsoncpp:x64-windows vcpkg integrate install

Please grab a fresh Windows machine, install VS and document steps needed to successfully build this solution. That would help a lot.

I just went through the steps in Developing.md and they seemed to work flawlessly for me. Are you experiencing any specific issues with the steps as they are laid out?

winget-cli/doc/Developing.md

Lines 24 to 33 in 7d72eb3

    
           ## Building the client 
        
           1. Clone the repository 
        
           2. Configure your system using the [configuration file](../.config/configuration.winget) in the repository. Run one of the following configurations from the project root so relative paths resolve correctly: 
        
              - For VS Community: `winget configure .config/configuration.winget` 
        
              - For VS Professional: `winget configure .config/configuration.vsProfessional.winget` 
        
              - For VS Enterprise: `winget configure .config/configuration.vsEnterprise.winget` 
        
           3. Run `vcpkg integrate install` from the Developer Command Prompt / Developer PowerShell for VS 2022. This is a one-time setup step until the configuration file in step 2 is updated to work with vcpkg setup. 
        
           Open `winget-cli\src\AppInstallerCLI.sln` in Visual Studio and build. We currently only build using the solution; command-line methods of building a VS solution should work as well.

	## Building the client

	1. Clone the repository
	2. Configure your system using the [configuration file](../.config/configuration.winget) in the repository. Run one of the following configurations from the project root so relative paths resolve correctly:
	- For VS Community: `winget configure .config/configuration.winget`
	- For VS Professional: `winget configure .config/configuration.vsProfessional.winget`
	- For VS Enterprise: `winget configure .config/configuration.vsEnterprise.winget`
	3. Run `vcpkg integrate install` from the Developer Command Prompt / Developer PowerShell for VS 2022. This is a one-time setup step until the configuration file in step 2 is updated to work with vcpkg setup.

	Open `winget-cli\src\AppInstallerCLI.sln` in Visual Studio and build. We currently only build using the solution; command-line methods of building a VS solution should work as well.