feat: add devlille

README.md

@@ -519,6 +519,7 @@ All the data (past and coming) are available publicly in JSON:
 
 * 3: [APIdays Helsinki and North](https://www.apidays.global/helsinki_and_north/) - Helsinki (Finland) <a href="https://apidays.typeform.com/to/ILJeAaV8"><img alt="CFP API Days Helsinki and North" src="https://img.shields.io/static/v1?label=CFP&message=until%2003-May-2025&color=green"></a>
 * 2-6: [DDD Europe - 2025](https://dddeurope.com/) - Antwerp (Belgium) <a href="https://sessionize.com/aardling2025"><img alt="CFP DDD Europe - 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2016-January-2025&color=green"></a>
+* 12-13: [DevLille](https://devlille.fr/) - Lille (France)
 * 16-19: [GopherCon Europe 2025: Summer Edition in Berlin](https://gophercon.eu) - Berlin (Germany)
 * 24: [WAX 2025](https://www.waxconf.fr/) - Aix-en-Provence (France) <a href="https://conference-hall.io/wax2025"><img alt="CFP WAX 2025" src="https://img.shields.io/static/v1?label=CFP&message=until%2024-May-2025&color=green"></a>