Create Install_passwordHasher_US.js.md

src/Install_passwordHasher_US.js.md

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+To install passwordHasher_US.js :
+
+cd /Users/darkfairie/Projets/Password\ Hasher/  # (From anywhere you want)
+
+npm init -y  # If you don't already have a package.json file
+
+npm install bcrypt
+
+node passwordHasher_US.js