[winforms-dotnet5] Move content - Accessibility

Related to #72

When porting and migrating source content (presented as a [link]() that goes to an article), open the source material up. Find out where it exists in the TOC. In the source project #72 navigate down to the **.NET Framework 4 TOC and my notes** collapsible region and expand it. Find the article title in the TOC and review the notes.

- [ ] Accessibility
- [ ] Overview (Needs more. [link from controls section](https://docs.microsoft.com/dotnet/desktop/winforms/controls/providing-accessibility-information-for-controls-on-a-windows-form?view=netframeworkdesktop-4.8))
- [ ] Improvements over .NET Framework ([link](https://docs.microsoft.com/dotnet/desktop/winforms/windows-forms-accessibility-improvements?view=netframeworkdesktop-4.8))
- [ ] Designing an accessible UI