[Keymap] Jonavin keymap Mercutio add win key lockout function (#13670)

Co-authored-by: Jonavin <=>

keyboards/mechwild/mercutio/keymaps/jonavin/readme.md

@@ -13,6 +13,7 @@ Features
   - shutdown oled when powered down to prevent OLED from showing Mercutio all the time
   - add WPM indicator when wpm is > 20 wpm
   - add double tap of Left Shift to toggle Caps Lock
+  - add WinLock feature with FN + Win; display WL on OLED when enabled
   
   - FN layer has encoder selectable key codes and displayed on OLED
         
@@ -28,8 +29,9 @@ Features
                 {"Break",   KC_PAUS},
                 {"C-A-D",   KC_CAD},  // Ctrl-Alt-Del
                 {"AltF4",   KC_AF4},
-                {"PLAY",    KC_MEDIA_PLAY_PAUSE}
-        };
+                {"PLAY",    KC_MEDIA_PLAY_PAUSE},
+                {"RESET",   RESET},  // firmware flash mode
+       };
 
   - Additional encoder functionality 
         While holding Left Ctrl, navigates next or previous word
@@ -37,4 +39,17 @@ Features
 
 
 Default Layers
-![image](https://user-images.githubusercontent.com/71780717/118902752-4aaf7880-b8e4-11eb-82f4-e5047612ffcf.png)
+![image](https://user-images.githubusercontent.com/71780717/127014682-3aa05136-6dc7-4a40-9be1-89a5b584848a.png)
+
+MO(1) / FN Layer
+![image](https://user-images.githubusercontent.com/71780717/127014620-a3a36dc6-6e22-4a9b-ad9a-6c6a5d18cbc5.png)
+
+MO(2) / Lower layer
+![image](https://user-images.githubusercontent.com/71780717/127014816-09598d62-2d23-42e5-a625-504a79a54ca9.png)
+
+MO(3) / Raise layer
+![image](https://user-images.githubusercontent.com/71780717/127014881-a181c198-a7e8-4f48-9789-a7a85eabcbd1.png)
+
+
+
+