docs: add ADR on JWT usage (#34) #1

Job	Run time
tests (ubuntu-latest, 3.11, pii_check)	30s
tests (ubuntu-latest, 3.11, quality)	30s
tests (ubuntu-latest, 3.11, docs)	40s
tests (ubuntu-latest, 3.12, docs)	42s
tests (ubuntu-latest, 3.11, django52)	24s
tests (ubuntu-latest, 3.12, pii_check)	34s
tests (ubuntu-latest, 3.11, django42)	32s
tests (ubuntu-latest, 3.12, django52)	23s
tests (ubuntu-latest, 3.12, django42)	32s
tests (ubuntu-latest, 3.12, quality)	36s
	5m 23s

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