Added the section installation and manual execution in the read me file.

Author: airvzxf

README.md

@@ -79,6 +79,40 @@ optional packages you found and filtered.
     - Commands:
         - `optional-packages -s no -p lsd kitty -s yes -e python gtk3 -p virtualbox -e perl -i no -i yes bat xterm`
 
+## INSTALLATION AND MANUAL EXECUTION
+
+### Installation
+
+#### Introduction
+
+This package is stored in the AUR (Arch Linux User Repository). AUR is a repository where anyone with an Arch Linux web
+account can upload a configuration file, which has instructions for downloading and installing the package. In addition,
+it contains information on the people who maintain or contribute to it.
+
+#### AUR package installer
+
+Normally, the `pacman` command is used to install official packages. However, this command does not work for AUR
+packages. There are specific tools that help AUR package management, like `yay`.
+
+To install this package, first [install yay][install yay] and then run the following
+command: `yay --sync optional-packages`.
+
+### Manual execution
+
+[Directly download][raw file of this package] the [optional-packages][this package file] file and use it on your
+computer.
+
+Verify that the file has the appropriate execution permissions for your needs: `ls --long optional-packages`. You can
+add execute permissions to the owner user with `chmod u+x optional-packages` or to all
+with `chmod +x optional-packages`.
+
+Run this tool with one of the following commands.
+
+- `./optional-packages --help`.
+- `bash optional-packages --help`.
+- `/usr/bin/env bash optional-packages --help`.
+- `/usr/bin/bash optional-packages --help`.
+
 ## CONTRIBUTE
 
 You can always follow the official GitHub guides: [contributing to projects][contributing to projects]
@@ -134,7 +168,7 @@ Use the version format vX.X.X, where X equals to numbers, for example: v45.7.211
 
 ### Change in the source code.
 
-- Manually change the version in [./src/optional-packages][package file in GitHub]. Find the variable `VERSION="vX.X.X"`
+- Manually change the version in [./src/optional-packages][this package file]. Find the variable `VERSION="vX.X.X"`
   in the first few lines and change it to the new version.
 - Check if the variable `ENV_IS_PRODUCTION` has the `true` value
   in [.github/workflows/deploy-to-aur.yml][deploy workflow in GitHub] file.
@@ -174,24 +208,28 @@ Use the version format vX.X.X, where X equals to numbers, for example: v45.7.211
 
 Review the complete [To-Do list][ToDo] to review what is pending.
 
-[new release url]: https://github.com/airvzxf/archlinux-optional-packages/releases/new
-
-[package file in GitHub]: ./src/optional-packages
+[AUR repository]: https://aur.archlinux.org/cgit/aur.git/?h=optional-packages
 
-[deploy workflow in GitHub]: .github/workflows/deploy-to-aur.yml
+[AUR webpage package]: https://aur.archlinux.org/packages/optional-packages
 
 [CI deploy to AUR]: https://github.com/airvzxf/archlinux-optional-packages/actions/workflows/deploy-to-aur.yml
 
-[AUR repository]: https://aur.archlinux.org/cgit/aur.git/?h=optional-packages
-
-[AUR webpage package]: https://aur.archlinux.org/packages/optional-packages
+[ToDo]: ./TODO.md
 
 [contributing to projects]: https://docs.github.com/en/get-started/quickstart/contributing-to-projects
 
+[deploy workflow in GitHub]: .github/workflows/deploy-to-aur.yml
+
 [fork a repository]: https://docs.github.com/en/get-started/quickstart/contributing-to-projects#creating-a-branch-to-work-on
 
+[fork optional packages project]: https://github.com/airvzxf/archlinux-optional-packages/fork
+
+[install yay]: https://github.com/Jguer/yay#installation
+
+[new release url]: https://github.com/airvzxf/archlinux-optional-packages/releases/new
+
 [optional packages GitHub project]: https://github.com/airvzxf/archlinux-optional-packages
 
-[fork optional packages project]: https://github.com/airvzxf/archlinux-optional-packages/fork
+[raw file of this package]: https://raw.githubusercontent.com/airvzxf/archlinux-optional-packages/main/src/optional-packages
 
-[ToDo]: ./TODO.md
+[this package file]: ./src/optional-packages