feat: Add Intellij Guardrails documentation

[lventura-codacy]

👀 Live preview

🚧 To do

• If relevant, include the Jira issue key at the end of the pull request title
• Perform a self-review of the changes
• Fix any issues reported by the CI/CD

[github-actions]

Overall readability score: 52.92 (🟢 +0.08)

File	Readability
integrating-codacy-with-intellij-ides.md	67.8 (🟢 +0.87)
codacy-guardrails-limitations.md	45.27 (🟢 +18.34)
codacy-guardrails-getting-started.md	57.68 (🟢 +0.02)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
integrating-codacy-with-intellij-ides.md	67.8	53.1	10.21	10.4	9.51	6.73
	🟢 +0.87	🟢 +0.3	🟢 +0.24	🟢 +0.1	🟢 +0.3	🔴 -0.05
codacy-guardrails-limitations.md	45.27	42.55	14.91	15.9	10.39	7.82
	🟢 +18.34	🟢 +7.27	🟢 +4.09	🟢 +6.1	🔴 -1.09	🟢 +0.87
codacy-guardrails-getting-started.md	57.68	47.22	11.89	13.8	10.57	6.68
	🟢 +0.02	🔴 -2.84	🔴 -0.24	🔴 -0.9	🟢 +0.11	🟢 +0.64

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	52.92	42.67	10.98	12.72	12.63	7.99
	🟢 +0.08	🟢 +0.02	🟢 +0.02	🟢 +0.02	🟢 +0	🟢 +0.01

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