Adding a clean theme quite suitable for daily use

Third-Party-Themes.md

@@ -43,3 +43,34 @@ Code:
   "name": "Kindle"
 }
 ```
+
+### Clean but mean
+*A theme focused on optimizing readability for a daily use but still keeping all the fun.*
+By [@josuahdemangeon](http://github.com/josuahdemangeon)
+Code:
+```json
+{
+  "ambientLight": 0,
+  "backgroundColor": "#000000",
+  "bloom": 0.1,
+  "brightness": 1,
+  "burnIn": 0,
+  "chromaColor": 1,
+  "contrast": 1,
+  "flickering": 0.3,
+  "fontColor": "#ffffff",
+  "fontName": "TERMINUS_SCALED",
+  "fontWidth": 1,
+  "frameName": "NO_FRAME",
+  "glowingLine": 0,
+  "horizontalSync": 0.25,
+  "jitter": 0.2,
+  "rasterization": 0,
+  "rbgShift": 0,
+  "saturationColor": 1,
+  "screenCurvature": 0,
+  "staticNoise": 0.05,
+  "windowOpacity": 1,
+  "name": "Clean"
+}
+```