[Readme] add note about windows only supporting double quotes

[nkappler]

fix #575

Removed the original section about escaping the quotes, since in the given example there was no escaping happening and rephrased it in the note about Windows only supporting double quotes:

Before:

In package.json, escape quotes:

"start": "concurrently 'command1 arg' 'command2 arg'"

After:

Important

Windows only supports double quotes:

concurrently "command1 arg" "command2 arg"

Remember to escape the double quotes in your package.json when using Windows:

"start": "concurrently \"command1 arg\" \"command2 arg\""

[coveralls]

coverage: 100.0%. remained the same
when pulling c3b2b8e on nkappler:patch-1
into 2c30e74 on open-cli-tools:main.

[nkappler]

the failing check is due to prettier running on Readme.md...
Is this intended?
Also, no specific error was reported