Add Calendly Oauth2 docs

[Joffcom]

Adds OAuth2 docs for Calendly

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[github-actions[bot]]

Overall readability score: 42.24 (🟢 +0.02)

File	Readability
calendly.md	65.08 (🟢 +44.68)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
calendly.md	65.08	44.81	8.42	10.1	11.98	7.16
	🟢 +44.68	🟢 +42.2	🟢 +4.5	🟢 +7.7	🟢 +7.02	🟢 +2.77

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	42.24	34.18	11.8	15.03	14.45	8.6
	🟢 +0.02	🟢 +0.03	🟢 +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

[Joffcom]

Thanks for fixing this @ayatnkw I can't approve my own PR though so you would need to approve it so we can merge :)