Yasir/task/new checker pattern

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Summary

I have introduced a modifier (stickerPatternType(_:)) that allows developers to set the pattern type to square, which is by default set to diamond.

Previously, the rotation degree was set to 45 degrees to give the pattern a diamond shape. I have now changed this value to 0 to make it square based on choice.

In the future, we can add more patterns, such as hexagon, circle, etc. To support this, I have created a switch-case structure in the Metal file and an enum in the Sticker module named StickerPattern.

Example usage:

Image(systemName: "bolt.fill")
    .font(.system(size: 300))
    .stickerEffect()
    .stickerPatternType(.square)

Updated Documentation

The README file has been updated to reflect these changes.

That's it

Let me know what do you think about it. Thank you!