Added theme screenshots and testing theme readme's

themes/README.org

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+#+title: My Themes
+#+author: Emmet
+
+Inside this directory are all of my themes!
+
+Each theme directory stores a few relevant files:
+- =${theme-name}.yaml= - This stores all 16 colors for the theme
+- =backgroundurl.txt= - A direct link to the wallpaper associated with the theme
+- =backgroundsha26.txt= - =sha256sum= of the wallpaper
+- =polarity.txt= - Whether or not the background is =light= or =dark=
+- =${theme-name}.png= - A screenshot of the theme for previewing purposes
+
+Click on any of the theme directories above for more info!  [[./theme-showcase.org][Here is a link]] showcasing all of the themes!

themes/ashes/README.org

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+#+title: Ashes
+#+author: Emmet
+
+"Ashes" base-16 theme originally by Jannik Siebert (https://github.com/janniks).
+
+[[ashes.png]]
+
+[[https://images.hdqwalls.com/wallpapers/anime-road-to-city-everlasting-summer-4k-ep.jpg
+][Background Link]]

themes/theme-showcase.org

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+#+title: Theme Showcase
+#+author: Emmet
+
+** Ashes
+[[./ashes][ashes/ashes.png]]
+** Atelier Cave
+[[./atelier-cave][atelier-cave/atelier-cave.png]]