new topics to cover

[rthomazel]

• as const
• exhaustive switch compile time checks using never
• ReturnType, ArgType0, ArgType1, function utilities etc...
• Record type #16
• optional chaining
• nullish coalescing
• readOnly
• Top-Level await
• assertion functions
• Pick
• Generics #15

[imteekay]

Added as const examples.

[imteekay]

Added readonly examples.

[imteekay]

Added optional chaining example.

[imteekay]

Added nullish coalescing examples.

[rthomazel]

awesome :D I can help with exhaustive switch compile time checks using never see #10

[imteekay]

Added Pick example.