doc: Move out docs from main README

docs/llamacpp-configuration.md

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+# Configure for llama.cpp
+
+1. Open Qt Creator settings and navigate to the QodeAssist section
+2. Go to General tab and configure:
+   - Set "llama.cpp" as the provider for code completion or/and chat assistant
+   - Set the llama.cpp URL (e.g. http://localhost:8080)
+   - Fill in model name
+   - Choose template for model(e.g. llama.cpp FIM for any model with FIM support)
+   - Disable using tools if your model doesn't support tooling
+
+<details>
+  <summary>Example of llama.cpp settings: (click to expand)</summary>
+
+<img width="829" alt="llama.cpp Settings" src="https://github.com/user-attachments/assets/8c75602c-60f3-49ed-a7a9-d3c972061ea2" />
+</details>
+