iOS Tutorial [Advanced]: Down-Scaling Image with the Best Practice - Swift

This project is a summary of down-scaling images in 5 different ways. All 5 ways are all from iOS different native framework, which are:
- UIKit
- Core Graphics
- Image I/O
- Core Image
- vImage

Some of them are from higher level framework like UIKit, which results in simpler API and easier uasage, on the contrary, some of them are from more basic or lower level framework like vImage, which results in much more complex code writing.

To use the extension file to down-scaling images, you can do: \
```swift
```

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