Added Jenkins Installation script

DevOps Tools - Added Jenkins Installation script

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.<br>
+Go to `http://<your_server_ip>:8080` to complete the initial setup using the displayed admin password. 
+Then you can configure Jenkins according to your requirements after the initial setup.
+
+
+> **Option**\
+> Feel free to delete the cloned directory when you are done with the installation
+
+**Good Luck**

DevOps-Tools/Jenkins/install-jenkins.sh

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+#!/bin/bash
+
+# Update the system
+sudo apt-get update
+
+# Install Java (required for Jenkins)
+sudo apt-get install -y openjdk-11-jdk
+
+# Add the Jenkins repository to the system
+wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
+
+# Add the Jenkins repository to the sources list
+sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
+
+# Update the system after adding the repository
+sudo apt-get update
+
+# Install Jenkins
+sudo apt-get install -y jenkins
+
+# Start Jenkins
+sudo systemctl start jenkins
+
+# Enable Jenkins to start on boot
+sudo systemctl enable jenkins
+
+# Display the status of Jenkins
+sudo systemctl status jenkins
+
+# Output initial admin password
+echo "Initial Admin Password:"
+sudo cat /var/lib/jenkins/secrets/initialAdminPassword