Add a temporary theme to test this PR

src/platform/web/ui/css/themes/element/manifest.json

@@ -1,6 +1,7 @@
 {
 	"version": 1,
-	"name": "element",
+    "name": "Element",
+	"id": "element",
 	"values": {
 		"font-faces": [
 			{
@@ -38,6 +39,20 @@
                     "room-badge": "#61708b",
                     "link-color": "#238cf5"
                 }
+            },
+            "violet": {
+                "dark": true,
+                "name": "Violet",
+                "variables": {
+                    "background-color-primary": "#21262b",
+                    "background-color-secondary": "#2D3239",
+                    "text-color": "#fff",
+                    "accent-color": "#03B381",
+                    "error-color": "#FF4B55",
+                    "fixed-white": "#fff",
+                    "room-badge": "#61708b",
+                    "link-color": "#238cf5"
+                }
             }
         }
 	}