Updated readme: NetCore and VS information, added disclaimer for the UncaughtReference error.

[SeppPenner]

Fixes #94, fixes #93, makes #95 redundant.

This pull request updates the information regarding requirements for Visual Studio and .NetCore and adds additional information on two commonly known issues: The Chart not drawn on client-side blazor in .netcore 3.0 from #93 and the Uncaught reference error from #94.

[Joelius300]

What do we want to do about the prerequisites? For this repo you don't need the preview for Visual Studio since we don't have client-side blazor in it. For the original repo you will need the preview AND you'll need .NET Core 3 preview 9 as well since client-side blazor is not available in .NET Core 3.0.

I think we should adjust it to how it's currently (.NET Core 3.0 and Visual Studio 2019 16.3) but keep the other things I said in mind for the original repo.

[Joelius300]

Do you approve these changes to your PR @SeppPenner?

[SeppPenner]

I think we should adjust it to how it's currently (.NET Core 3.0 and Visual Studio 2019 16.3) but keep the other things I said in mind for the original repo.

Yeah, that's a good idea.

[Joelius300]

I guess that's an approval :) I'll merge it.

[Joelius300]

The commit history of this PR is pretty bad for some reason. Maybe we should've organized it first but since it was squashed it's not a problem in master. I will leave it like this.

[SeppPenner]

The commit history of this PR is pretty bad for some reason.

I have seen that, but I have actually no idea why...