Create 03-install-ubuntu.md

Signed-off-by: Thomas Pichler <54631167+PichlerThomas@users.noreply.github.com>

Author: PichlerThomas

web4-env-setup/install/windows/03-install-ubuntu.md

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+# Step 03 – Install Ubuntu (WSL) on Windows
+
+This step covers installing the Ubuntu Linux distribution via the Microsoft Store, setting it up, and creating your initial Linux user.
+
+---
+
+## 🧭 Overview
+
+| Step | Action |
+|-------|--------|
+| 2.1   | Download and install Ubuntu from Microsoft Store |
+| 2.2   | Launch Ubuntu for the first time |
+| 2.3   | Create a Linux user account |
+
+---
+
+## 🧩 Detailed Steps
+
+### 2.1 Download and Install Ubuntu
+
+- Open this link in your browser or directly open the Microsoft Store app:  
+  [Ubuntu on Microsoft Store](https://apps.microsoft.com/store/detail/ubuntu/9PDXGNCFSCZV?hl=de-de&gl=de&rtc=1)
+- Click **Get** (or **Install**) to download and install Ubuntu on your Windows machine.
+- Wait for the installation to complete.
+
+---
+
+### 2.2 Launch Ubuntu for the First Time
+
+- After installation, click **Launch** in the Microsoft Store, or open Ubuntu from your Start Menu.
+- The terminal window will open and complete the installation process.
+
+---
+
+### 2.3 Create a Linux User Account
+
+- You will be prompted to create a new UNIX username.
+- Enter your preferred username and press **Enter**.
+- Next, set a password (you won’t see characters while typing). Press **Enter**.
+- Confirm the password by typing it again and pressing **Enter**.
+- Your Ubuntu WSL environment is now set up and ready to use.
+
+---
+
+## ✅ Outcome
+
+- Ubuntu is installed on Windows via WSL.
+- A Linux user account is created.
+- You can now use Ubuntu terminal inside Windows for development and running Linux tools.