Added: LDM notes for July 10th and July 17th

[agocke]

July 10th

1. Empty switch statement
2. [DoesNotReturn] attribute
3. Revisiting the param! null-checking feature

July 17th

1. Nullability of events

2. Triage, see https://github.com/dotnet/csharplang/projects/4

   • Triage championed features https://github.com/dotnet/csharplang/projects/4#column-4649189
   • Triage milestones

[svick]

No place to put ! on the property setter

What about set!? E.g.:

public string P { get; set!; } // auto-property

public string P // regular property
{
    get => …;
    set! => …;
}