Automate - Join Windows 10 to Azure AD

Looking to automate the joining of a Windows 10 computer to Azure Active Directory 2 versions or single version which checks the Windows 10 build and does the following; System > About > Join Azure AD > (enters username and password from a text file, this allows us to change as and when required) > Sign in > Join And / Or, depending if you do it as one or two versions. Difference being after 1703 below System > About > Connect to work or school > Connect > Join this device to Azure Active Directory > (enters username and then password from a text file, this allows us to change as and when required) > Sign in > Join This needs to be a simple script, or program. I require the source, but this will be owned by you. I will provide a demo Azure Active Directory and credentials for you to test, should you need to. Thanks, Brad