- Added shrink docs

- Added shrink documentation which is based on pixelbox by 9551Dev

docs/objects/Image/getShrinkedImage.md

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+## getShrinkedImage
+
+### Description
+
+The getShrinkedImage method generates a Blit-Image version of a standard Image object and returns it as a table. By using this method, the resulting image will only retain the background (BG) data, and both foreground (FG) and text information will be lost.
+
+Shrinking the image is calculated by pixelbox, a algorithm created by 9551Dev. You can find his awesome work [here](https://github.com/9551-Dev/apis/blob/main/pixelbox_lite.lua)!
+
+### Returns
+
+1. `table` A table representing the Blit-Image version of the Image object, containing only the background data.
+
+### Usage
+
+* Creates a default image and loads a test.nfp file
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+local image = mainFrame:addImage:loadImage("path/to/your/image.nfp")
+
+local blitImage = image:getShrinkedImage()
+```