Update and rename docs/bpp.md to docs/reference/image/bpp.md

Author: DeveloperTryingToCodeLikeOtherOfThem

docs/bpp.md docs/reference/image/bpp.mddocs/bpp.md renamed to docs/reference/image/bpp.md

@@ -3,4 +3,9 @@
 A **BPP** is short for Bits Per Pixel, which tells how many possible color values are for that one pixel. For example, 
 if there are 16 colors in the palette editor, there are 4 bits per pixel are required because 2⁴ = 16. That is why
 MakeCode uses 4 bits per pixel. It is very useful for packing and unpacking because it is just the right value
-for getting how many bits per pixel.
+for getting how many bits per pixel:
+``` ts
+   bpp() {
+       return this.palette.length > 2 ? 4 : 1
+   }
+```