Update Readme.MD

[NoralK]

Not all properties are listed.

[x2bool]

What properties are missing?

[derekantrican]

CFBundleShortVersionString for one. Also the README is just generally lacking a lot of info. Running dotnet msbuild -t:BundleApp -p:RuntimeIdentifier=osx-x64 (as per the README) for the first time and I got the the error The "BundleAppTask" task was not given a value for the required parameter "CFBundleShortVersionString". I can't find info about that anywhere

[maxkatz6]

This property is not required, but mistake in task code:

<CFBundleShortVersionString Condition="'$(CFBundleVersion)' == ''">$(CFBundleVersion)</CFBundleShortVersionString>