Update readme.md

Author: dg

readme.md

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-Nette Dependency Injection (DI)
-===============================
+[![Nette Dependency Injection](https://github.com/nette/di/assets/194960/d368a458-bac1-48b1-9b4b-7929f4bb2f98)](https://doc.nette.org/dependency-injection)
 
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