Add README

README.md

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+# Blueberries Mastodon UI user theme
+
+This is a Mastodon UI user theme by @brodokk heavly based on a work from
+@HugoBDesigner who can be found here: https://gist.github.com/HugoBDesigner/1a784bf782b5994efecfb9e3adf85fc6
+
+Its for being use with the web extension stylus https://add0n.com/stylus.html
+(who is a fork of Stylish). This theme is also available on userstyles.org:
+https://userstyles.org/styles/254893/blueberries-mastodon-ui-user-theme
+
+## Customization
+
+The customization is pretty simple, if you just want to just change the general
+them color. The the top of the file change the `CURRENT HUE` in the `:root`
+css rule to what you want, avocado by @HugoBDesigner is also available:
+
+```
+:root {
+    /* DEFAULT HUE */
+    /*     --hue: 240deg; */
+    /* AVOCADO HUE */
+    /*     --hue: 90deg; */
+    /* BLUEBERRIES HUE */
+    /*     --hue: 300deg; */
+    /* CURRENT HUE */
+    --hue: 300deg;
+}
+```
+
+## Screenshoots
+
+![Simple view](https://userstyles.org/style_screenshots/254893_after.png)
+![Advanced view](https://userstyles.org/style_screenshots/254893_additional_41579.png)