appended by Github Actions

Author: github-actions[bot]

README.md

@@ -21,18 +21,23 @@
   - [Features](#features)
 - [Status](#status)
 - [Documentation](#documentation)
+  - [Usage](#usage)
+    - [Rules](#rules)
   - [Encryption](#encryption)
+    - [Linux](#linux)
   - [Decryption](#decryption)
+  - [configuration: dotenv or env](#configuration-dotenv-or-env)
   - [Test / Performance](#test--performance)
 - [Installation](#installation)
-  - [Linux](#linux)
+  - [Linux](#linux-1)
   - [MacOS](#macos)
   - [Windows](#windows)
 - [Development](#development)
   - [Dependencies](#dependencies)
     - [CMake](#cmake)
     - [QT](#qt)
     - [Qt-AES](#qt-aes)
+    - [dotenv-cpp](#dotenv-cpp)
   - [folder structure](#folder-structure)
 - [Authors and License](#authors-and-license)
   - [MIT License](#mit-license)