Add comprehensive translation documentation

Co-authored-by: chipitsine <2217296+chipitsine@users.noreply.github.com>

TURKISH_TRANSLATION.md

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+# Turkish Translation Status
+
+The Turkish (Türkçe) language infrastructure has been added to SoftEther VPN.
+
+## Current Status
+
+- ✅ Language entry added to `languages.txt` (ID: 8, identifier: `tr`)
+- ✅ String table file created: `strtable_tr.stb`
+- ✅ File structure validated with stbchecker
+- ⚠️ **Translation needed**: The file currently contains English text as placeholders
+
+## How to Contribute
+
+The Turkish string table (`src/bin/hamcore/strtable_tr.stb`) currently uses English text. We need native Turkish speakers to translate these strings.
+
+### For Contributors
+
+If you'd like to help with the Turkish translation:
+
+1. See [TRANSLATION_GUIDE.md](TRANSLATION_GUIDE.md) for detailed instructions
+2. The main file to translate is: `src/bin/hamcore/strtable_tr.stb`
+3. It contains approximately 7,400+ lines, but many are comments or formatting
+4. You can contribute partial translations - every bit helps!
+
+### Quick Start
+
+1. Fork this repository
+2. Open `src/bin/hamcore/strtable_tr.stb`
+3. Translate the text values (keep the keys unchanged)
+4. Run the validation tool:
+   ```bash
+   cd developer_tools/stbchecker
+   dotnet run ../../src/bin/hamcore
+   ```
+5. Submit a Pull Request with your translations
+
+### Translation Guidelines
+
+- Keep technical terms like "VPN", "SSL", "TCP/IP" in English
+- Preserve formatting codes like `%s`, `%d`, `\r\n`
+- Maintain the same meaning and tone as the English version
+- Use formal Turkish ("siz" form) for user-facing messages
+- Be consistent with terminology throughout
+
+### Already Translated
+
+The following metadata has been localized:
+- Language identifier: Turkish
+- Language ID: 8
+- Weekday abbreviations: Paz, Pzt, Sal, Çar, Per, Cum, Cmt
+- "None" translated to "Hiçbiri"
+
+## Questions?
+
+If you have questions about the translation:
+- Open an issue on GitHub
+- Tag it with `translation` and `Turkish`
+- Reference this file or the main TRANSLATION_GUIDE.md
+
+## Thank You!
+
+Thank you to VamHunD and all contributors who help make SoftEther VPN accessible to Turkish users!