Currying 1 
by Anthony Fu @antfu
> TypeScript 4.0 is recommended in this challenge
[Currying](https://en.wikipedia.org/wiki/Currying) is the technique of converting a function that takes multiple arguments into a sequence of functions that each take a single argument.
For example:
```ts
const add = (a: number, b: number) => a + b
const three = add(1, 2)
const curriedAdd = Currying(add)
const five = curriedAdd(2)(3)
```
The function passed to `Currying` may have multiple arguments, you need to correctly type it.
In this challenge, the curried function only accept one argument at a time. Once all the argument is assigned, it should return its result.
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