Update README.md

Author: charlypa

README.md

@@ -1,2 +1,5 @@
 # signtool
  This signtool aids in signing Windows binaries via EV certificates from Tauri, utilizing GitHub actions.
+# How to use this tool
+1. Copy this tool to `build-src/win` folder in your Tauri project
+2. copy `copysigntool` https://github.com/phcode-dev/copySignTool also to `build-src/win` folder in your Tauri project