Adding a README and previews.

README.md

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+A wallpaper template for mjswensen/themer.
+
+## Installation & usage
+
+Install this module wherever you have `themer` installed:
+
+    yarn add themer-wallpaper-block-wave
+
+Then pass `themer-vim` as a `-t` (`--template`) arg to `themer`:
+
+    themer -c my-colors.js -t themer-wallpaper-block-wave -o gen
+
+`themer-wallpaper-block-wave` will generate SVG and PNG wallpapers to the output directory (`gen/` in this example).
+
+### Default resolutions
+
+By default, `themer-wallpaper-block-wave` will output wallpapers at the following sizes:
+
+* 2880 by 1800 (desktop)
+* 750 by 1334 (device)
+
+### Custom resolutions
+
+`themer-wallpaper-block-wave` adds the following argument to `themer`:
+
+    --themer-wallpaper-block-wave-size
+
+to which you would pass `<width>x<height>`. For example, to forego the default resolutions and generate two wallpapers, one 1024 by 768 and one 320 by 960:
+
+    themer -c my-colors.js -t themer-wallpaper-block-wave --themer-wallpaper-block-wave-size 1024x768 --themer-wallpaper-block-wave-size 320x960 -o gen
+
+## Previews
+
+The following are rendered using themer's default color set (mjswensen/themer-colors-default):
+
+![dark desktop](/assets/desktop-dark.png)
+![light desktop](/assets/desktop-light.png)
+![dark device](/assets/device-dark.png)
+![light device](/assets/device-light.png)