Update README.md

Author: cssho

README.md

@@ -43,12 +43,15 @@ The following Visual Studio Code setting is available for the SVG Viewer.  This
 ```javascript
 {
     // Show Transparency Grid
-	"svgviewer.transparencygrid": true,
+    "svgviewer.transparencygrid": true,
 
     // Open or not open the preview screen automatically
     "svgviewer.enableautopreview": true,
 
     // How to open the screen (vscode.ViewColumn)
-    "svgviewer.previewcolumn": true
+    "svgviewer.previewcolumn": Two,
+    
+    // Color setting for transparency
+    "svgviewer.transparencycolor": "#2BD163"
 }
 ```