Add Groq Chat model docs & credentials

[OlegIvaniv]

n8n-io/n8n#9250

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[github-actions]

Overall readability score: 45.25 (🔴 -0.03)

File	Readability
n8n-nodes-langchain.lmchatgroq.md	20.03 (-)
groq.md	37.81 (-)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
n8n-nodes-langchain.lmchatgroq.md	20.03	14.86	13.21	19.5	19	9.75
	-	-	-	-	-	-
groq.md	37.81	21.36	8.27	16.3	17.53	9.28
	-	-	-	-	-	-

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	45.25	38.97	11.89	14.37	13.54	8.56
	🔴 -0.03	🔴 -0.04	🟢 +0	🔴 -0.01	🔴 -0.01	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[OlegIvaniv]

Thanks for that, I always forget to register these new docs 😅
I merged the implementation branch BTW