add externalized hashPassword.js

src/lib/js/hashPassword.js

@@ -0,0 +1,10 @@
+import { hash } from 'argon2'
+export async function hashPassword(password, salt) {
+  try {
+    const hashedPassword = await hash(password, salt); // Hash the password with the salt and pepper
+    return hashedPassword;
+  } catch (error) {
+    console.error('Error hashing password:', error);
+  }
+}
+