feat: 📝 add configuration doc for Mistral AI #485

Job	Run time
Build on ubuntu-latest - 17	12m 28s
Test on ubuntu-latest - 21	8m 48s
azure-openai native tests	11m 14s
bam native tests	3m 58s
devui native tests	1m 7s
hugging-face native tests	4m 0s
mistralai native tests	4m 52s
multiple-providers native tests	4m 10s
ollama native tests	4m 6s
openai native tests	5m 11s
simple-ollama native tests	4m 38s
	1h 4m 32s

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