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: 52.91 (🟢 +0.07)

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	55.77 (🔴 -1.88)

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	55.77	46.3	12.28	14.3	10.62	6.77
	🔴 -1.88	🔴 -3.76	🔴 -0.63	🔴 -1.4	🟢 +0.06	🟢 +0.55

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	52.91	42.66	10.99	12.73	12.63	7.99
	🟢 +0.07	🟢 +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