Create 01-install-docker.md

Signed-off-by: Thomas Pichler <[email protected]>

Author: PichlerThomas

web4-env-setup/day1/01-install-docker.md

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+# Step 1: Install Docker Desktop
+
+## 🎯 Goal
+Install Docker Desktop to enable containerized development with Web4.x.
+
+## 🧰 Prerequisites
+- Windows 10/11 with WSL2 support
+- Admin privileges
+
+## 📦 Download & Install
+1. Visit the official Docker Desktop site: [https://www.docker.com/products/docker-desktop](https://www.docker.com/products/docker-desktop)
+2. Download and run the installer.
+3. Enable the WSL 2 backend when prompted.
+4. Restart your system if necessary.
+
+## ✅ Verification
+Run the following in your terminal:
+
+```bash
+docker --version