Add guide

Author: awlx

MULTILANG_SIMPLE_GUIDE.md

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+# How to Write Multi-Language Posts - Simple Guide
+
+This is the **easiest way** to create posts in multiple languages without knowing HTML.
+
+## Quick Start (Copy & Paste)
+
+Just copy the template below into a new post file. Replace the text in each colored section with your content.
+
+```markdown
+---
+layout: posts
+title: "Your German Title Here"
+date: 2026-01-XX 12:00:00
+categories: freifunkmuc
+translations: [en, fr, es, ua]
+---
+
+<section data-lang="de" class="language-content active" markdown="1">
+
+**German Title or Heading**
+
+Replace this with your German text.
+
+You can write normally:
+- Use bullet points
+- **Make text bold**
+- [Add links](https://example.com)
+- Create | tables | like | this |
+
+</section>
+
+<section data-lang="en" class="language-content" markdown="1">
+
+**English Title or Heading**
+
+Replace this with your English translation.
+
+</section>
+
+<section data-lang="fr" class="language-content" markdown="1">
+
+**French Title or Heading**
+
+Replace this with your French translation.
+
+</section>
+
+<section data-lang="es" class="language-content" markdown="1">
+
+**Spanish Title or Heading**
+
+Replace this with your Spanish translation.
+
+</section>
+
+<section data-lang="ua" class="language-content" markdown="1">
+
+**Ukrainian Title or Heading**
+
+Replace this with your Ukrainian translation.
+
+</section>
+```
+
+## What Each Line Means (For Reference)
+
+- `{::options parse_block_html="true" /}` = Tells Jekyll "please render markdown below"
+- `data-lang="de"` = This block is German
+- `class="language-content active"` = Show this by default
+- `markdown="1"` = Render markdown inside this box
+- The language switcher in top-right handles the rest automatically
+
+## That's All You Need to Know!
+
+- Just copy the template
+- Replace the 5 text sections with your translations
+- Save the file with format: `_posts/YYYY-MM-DD-your-title.markdown`
+- Done! No HTML knowledge required.
+
+The language switcher automatically:
+- Shows German by default
+- Detects user's browser language
+- Saves user's choice in their browser
+- Switches content when they click the dropdown