feat: Added chapter 6 first auth attempt

internal/auth/auth.go

@@ -0,0 +1,12 @@
+package auth
+
+import "golang.org/x/crypto/bcrypt"
+
+func HashPassword(password string) (string, error) {
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 10)
+	return string(hashedPassword), err
+}
+
+func CheckPasswordHash(password, hash string) error {
+	return bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+}