feat (user): add create

pkg/password/password.go

@@ -0,0 +1,17 @@
+package password
+
+import (
+	"golang.org/x/crypto/bcrypt"
+)
+
+var Cost = 10 // can be set by consumer
+
+func Hash(password string) (string, error) {
+	bytes, err := bcrypt.GenerateFromPassword([]byte(password), Cost)
+	return string(bytes), err
+}
+
+func Check(password, hash string) bool {
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	return err == nil
+}