Add examples for the built-in types mentioned in the readme

[sindresorhus]

I made a section in the readme for useful built-in types that many TS devs don't know about. Would be useful to also include some real-world examples of those types in use. It's hard to realize when they would be useful just from their description.

https://github.com/sindresorhus/type-fest#built-in-types

To resolve this issue you should at least add one realistic example for each type.

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• #35 Built-in types examples

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[sindresorhus]

Here's one use-case for Partial. Ability to set required properties after variable declaration: https://www.typescriptlang.org/play/index.html#src=type%20wow%20%3D%20%7B%0D%0A%20%20%20%20a%3A%20number%2C%0D%0A%20%20%20%20b%3F%3A%20number%0D%0A%7D%0D%0A%0D%0Afunction%20getWow()%3A%20wow%20%7B%0D%0A%20%20%20%20const%20o%3A%20Partial%3Cwow%3E%20%3D%20%7B%7D%3B%0D%0A%0D%0A%20%20%20%20o.a%20%3D%201%3B%0D%0A%0D%0A%20%20%20%20if%20(Math.random()%20%3C%200.5)%20%7B%0D%0A%20%20%20%20%20%20%20%20o.b%20%3D%202%3B%0D%0A%20%20%20%20%7D%0D%0A%0D%0A%20%20%20%20return%20o%20as%20wow%3B%0D%0A%7D

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[Keraito]

Hey, I would like to give this a shot! A few questions tho:

1. Can examples, based on the context, also be for certain frameworks like React? Or do they have to be for JS/Node?
2. How do you want the examples to be included? Just suffix the list items of "Built-in types" with [examples](link/to/ts-playground) ?
3. Regarding IssueHunt, should I have one 'final' PR or is it alright to divide the examples over different PRs?

[sindresorhus]

1. Sure, but should be something most people are familiar with like Node.js/React/etc.
2. I was thinking just a code block inside a <detail> to toggle it, but a playground is good too, as long as it's focused and doesn't include too much unrelated code.
3. IssueHunt-wise it would be best with one PR.

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