Added content for hamburger menu

src/content/hamburger-menu.md

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+---
+slug: '/hamburger-menu'
+date: '2023-02-29'
+title: 'Hamburger Menu'
+type: 'css'
+image: '../images/hamburger-menu.gif'
+codepen: 'https://codepen.io/redlpd-mg/pen/vYMYNVM'
+author: 'Red Lapida'
+github: 'https://github.com/mashupgarage/css-blitz/pull/2'
+entries:
+  - name: 'N/A'
+    url: 'https://example.com'
+---
+
+* ⌛ You have 15 minutes to implement this, take your time (but not too much)!
+* 💅 Feel free to embellish and make it pretty!
+* 📦 Some basic CSS is provided for you. There are some `TODO` comments in there to help you out.
+* 🧙 You can search online if you get stuck.
+* 🎉 When you're done, `Fork` 🍴 the Codepen page and share with us the URL.
+
+<p align='center'>* * *</p>
+
+## Tips and hints
+
+- Use checkbox.
+- Clicking the label should activate the input.
+- Visibilty (`display` and `opacity`).
+- Use `transform` with `translate` and `rotate`.