[themes/zengarden] add key colors

themes/zengarden-powerline-light.json

@@ -60,5 +60,19 @@
             "fg": "#353839",
             "bg": "#378c5d"
         }
-    }
+    },
+	"keys": {
+		"Key.cmd": {
+			"bg": "#477ab7"
+		},
+		"Key.shift": {
+			"bg": "#b38a32"
+		},
+		"Key.ctrl": {
+			"bg": "#377c8b"
+		},
+		"Key.alt": {
+			"bg": "#e05b1f"
+		}
+	}
 }