Added Linux introduction and distribution explanation with diagram - …

Week 1 - Linux Fundamentals/Topic 1/Introduction to Linux/Subtopic 1.md

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+# 🐧 Introduction to Linux 
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+
+The Linux Operating System helps communicate between software and computer hardware components like the **CPU**, **RAM**, and **hard drives**. An operating system acts as a supportive middle layer, translating user commands into instructions the hardware can execute.
+
+---
+
+## 📊 Diagram: Linux System Overview
+
+![Linux OS Diagram](../assets/linux-os-diagram.png)
+

Week 1 - Linux Fundamentals/Topic 1/Introduction to Linux/Subtopic 2.md

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+## 📦 What Is a Linux Distribution?
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+After the release of the Linux kernel, lot of  communities and companies started building distributions to make it accessible for different types of users, such as **server administrators**, **developers**, and more.
+
+Each distribution includes:
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+- A **package manager** (e.g., `apt` for Ubuntu, `dnf` for Fedora)
+- A **Graphical User Interface (GUI)** (in many cases)
+- A set of **pre-installed software** and tools
+
+These components make the distribution a complete and ready-to-use operating system.
+
+---
+
+## 📋 Examples of Linux Distributions
+
+- **Ubuntu** – User-friendly and great for beginners
+- **Fedora** – Cutting-edge and sponsored by Red Hat
+- **Arch Linux** – Customizable and rolling-release
+- **Alpine Linux** – Lightweight, ideal for containers
+
+Each distribution has its own use cases and advantages. For example, server admins might prefer Alpine for containers, while developers might go for Ubuntu or Arch depending on their workflow.
+
+---
+
+## 🧩 Key Differences Between Distributions
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+All Linux distributions combine the Linux kernel with tools, software, and libraries tailored for specific purposes. They mainly differ by:
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+- 🌀 **Release models** – Fixed releases (like Ubuntu) vs. rolling releases (like Arch)
+- 👨‍💻 **Target users** – Beginners, system admins, developers
+- ⚙️ **Default configurations** – GUIs, services, and preloaded software
+
+---