chore: update README requirement

README.md

@@ -7,9 +7,13 @@ Display tsc errors count on file tree.
 <img width="612" alt="image" src="https://user-images.githubusercontent.com/46062972/190348158-a42b47d5-468f-4b9e-b555-36f6dc680fc4.png">
 
 ## Requirement
-
+ 
 - node version: >=16
 - tsc version: >=4.5.5
+- Installed [Nerd Font](https://github.com/ryanoasis/nerd-fonts)
+
+> Warning: We only recommend you to use this CLI app in Mac OS or Linux, 
+  since it's using a lot of shell features which may not have good support in Windows.
 
 ## Install