Add Gruvbox Theme (#56)

* Adds Gruvbox Theme

* Removes README from the theme repo

Gruvbox/Gruvbox.json

@@ -0,0 +1,38 @@
+{
+  "name": "Gruvbox",
+  "is_dark": true,
+  "colors": {
+    "accent-color": "#bd93f9",
+    "primary-color": "#fe8019",
+    "warning-color": "#fb4934",
+    "sidebar-color": "#282828",
+    "roomlist-background-color": "#1d2021",
+    "roomlist-text-color": "#a89984",
+    "roomlist-text-secondary-color": "#00ff00",
+    "roomlist-highlights-color": "#00000030",
+    "roomlist-separator-color": "#4d4d4d90",
+    "timeline-background-color": "#282828",
+    "timeline-text-color": "#ebdbb2",
+    "secondary-content": "#928374",
+    "tertiary-content": "#928374",
+    "quinary-content": "#504945",
+    "timeline-text-secondary-color": "#a89984",
+    "timeline-highlights-color": "#00000030",
+    "reaction-row-button-selected-bg-color": "#689d6a",
+    "menu-selected-color": "#504945",
+    "icon-button-color": "#928374",
+    "accent": "#689d6a",
+    "alert": "#cc241d",
+    "username-colors": [
+      "#cc241d",
+      "#98971a",
+      "#d79921",
+      "#458588",
+      "#b16286",
+      "#689d6a",
+      "#a89984",
+      "#d65d0e"
+    ],
+    "avatar-background-colors": ["#458588", "#b16286", "#689d6a"]
+  }
+}

README.md

@@ -168,6 +168,11 @@ Made by `@acxz:matrix.org`
 
 ![Wal Theme Screenshot](https://user-images.githubusercontent.com/17132214/162074643-a5dbca97-b6c3-4cf6-90c6-b1a6d244c72e.png)
 
+## [Gruvbox Theme](Gruvbox/Gruvbox.json)
+
+Made by [Jeroen van Meerendonk](https://github.com/jeroenwtf)
+
+![Gruvbox Theme Screenshot](Gruvbox/Gruvbox.png)
 
 # Advanced