Automate colour palette creation

In #4 and #10, the palettes were populated like this:
- Visit materialpalette.com
- Select two colours
- Copy "dark primary color", "light primary color", "primary color" and "accent color" into a 4 item array in the Resources file "array.xml"
- Name the array after the two colours, e.g. "material_color_palette_blue_amber"
- Add the array to the array of Resource IDs, "material_color_palettes"

This process has been done manually so far, but seems like a candidate for automation.