Add ColorSchemeCategorizer package

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• [x] I'm the package's author and/or maintainer.
• [x] I have have read [the docs][1].
• [x] I have tagged a release with a [semver][2] version number.
• [x] My package repo has a description and a README describing what it's for and how to use it.
• [x] My package doesn't add context menu entries. *
• [x] My package doesn't add key bindings. **
• [x] Any commands are available via the command palette.
• [x] Preferences and keybindings (if any) are listed in the menu and the command palette, and open in split view.

My package is ColorSchemeCategorizer — a way to list and select light and dark color schemes separately.

There are no packages like it in Package Control.