Rule : Color values shouldn't be hardcoded in xml attributes

[jd-alexander]

Expected behavior

Color values shouldn't be hardcoded in XML files. They should be placed in the color resources (colors.xml).

Actual behavior

You can place the color values within XML files and there are no issues. The build still passes locally and on CI.

Steps to reproduce the behavior

1. Add a raw color value to an XML attribute.
2. Notice that when you run the lintCheck it doesn't fail.