docs: mention about standalone application setup

[necipallef]

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Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	74.29%	26/35
🟡	Branches	60%	3/5
🟢	Functions	80%	4/5
🟡	Lines	71.88%	23/32

Test suite run success

6 tests passing in 1 suite.

Report generated by 🧪jest coverage report action from 02bff83

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St	File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
🟡	All files	74.28	60	80	71.87
🔴	src	0	100	100	0
🔴	public-api.ts	0	100	100	0	5-12
🟢	src/lib	92.3	60	100	91.3
🟢	fingerprint.module.ts	100	100	100	100
🟢	fingerprint.service.ts	89.47	60	100	88.88	57,64
🟢	version.ts	100	100	100	100
🟡	src/lib/tokens	66.66	100	0	66.66
🟡	fingerprint-angular-settings-token.ts	66.66	100	0	66.66	7