Add a note for PowerShell users.

Author: vitalikpi

Readme.md

@@ -58,6 +58,12 @@ setInterval(function(){
  ```cmd
  set DEBUG=*,-not_this
  ```
+ 
+ Note that PowerShell using different syntax to set environment variables.
+ 
+ ```cmd
+ $env:DEBUG = "DEBUG=*,-not_this"
+  ```
 
 Then, run the program to be debugged as usual.