kılavuz: dil dizinleri (en/tr/de/fr/ru) + dil değiştirici ve bölüm gezinmesi

- iki dilli tek dosyalar en/ ve tr/ altına ayrıldı
- Almanca, Fransızca, Rusça çeviriler eklendi (10 bölüm)
- kök README dil seçici oldu; her dilde kendi içindekiler sayfası
- her bölüme dil değiştirici satırı + önceki/sonraki gezinme eklendi

en/06-markdown-basics/readme.md

@@ -0,0 +1,83 @@
+# 06 — Markdown basics
+
+🌍 **English** · [Türkçe](../../tr/06-markdown-basics/readme.md) · [Deutsch](../../de/06-markdown-basics/readme.md) · [Français](../../fr/06-markdown-basics/readme.md) · [Русский](../../ru/06-markdown-basics/readme.md)
+
+Markdown is plain text with a few punctuation rules. Files ending in `.md` are rendered automatically, and a file named `readme.md` is shown on its folder page.
+
+## Headings
+
+```markdown
+# Title
+## Section
+### Subsection
+```
+
+Leave a blank line before and after a heading.
+
+## Text
+
+```markdown
+**bold**  *italic*  ~~struck through~~  `code`
+```
+
+A single line break is ignored. To start a new paragraph, leave a blank line.
+
+## Lists
+
+```markdown
+- first
+- second
+  - nested (two spaces)
+
+1. step one
+2. step two
+```
+
+## Links
+
+```markdown
+[KabaForge](https://forge.kabaforce.com)
+[chapter 04](../04-create-directory/readme.md)
+```
+
+Links to files in the same repository are best written as relative paths — they keep working on every branch.
+
+## Code
+
+Fenced blocks keep spacing and add colours. Write the language after the opening fence:
+
+~~~markdown
+```bash
+git status
+```
+~~~
+
+## Tables
+
+```markdown
+| Column | Meaning |
+|--------|---------|
+| `main` | default branch |
+| `.md`  | Markdown file |
+```
+
+## Quotes, rules, tasks
+
+```markdown
+> A quoted note.
+
+---
+
+- [x] done
+- [ ] not done yet
+```
+
+## Practical tips
+
+- Preview before committing: the **Preview** tab in the editor renders exactly what others will see.
+- Keep one sentence per line in long documents — differences between versions stay readable.
+- Emoji work directly: 📌 ✅ ⚠️
+
+---
+
+⬅ [Previous: 05 — Deleting files and directories](../05-delete-files/readme.md) · 📚 [Contents](../README.md) · [Next: 07 — Images and attachments](../07-images-and-media/readme.md) ➡