readme file for jenkins

Co-authored-by: @the1Riddle <elvisotienomboya@gmail.com>

Author: rezzcode

DevOps-Tools/Jenkins/README.md

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+# Jenkins Installation
+
+The bash script in `install-jenkins` files automates the installation of the Jenkins (LTS) version on a Debian-based Linux system that includes Ubuntu and more.<br>
+The script will first request for updates, then install Java which is a prerequisite for Jenkins after that it:
+- Installs Jenkins
+- Starts the service
+- Displays the initial admin password.
+
+# How to use the Installation script
+
+1. Open your terminal by pressing the `ctrl + alt + t` command on your keyboard.
+2. You can then clone this repo using the command:
+   
+   ```
+   git clone https://github.com/the-1Riddle/packageInstallationHub.git
+   ```
+3. Move to the directory where the script is, you can use this command:
+   
+   ```
+   cd packageInstallationHub/DevOps-Tools/Jenkins
+   ```
+4. Execute the file to install the package.
+
+   ```
+   sudo ./install-jenkins.sh
+   ```
+
+Lastly, when the execution is done, the initial admin password will be displayed in the terminal. You can then go to `http://<your_server_ip>:8080` 
+to complete the initial setup using the displayed admin password.<br>
+You can configure Jenkins according to your requirements after the initial setup.
+
+**Good Luck**