Add Architecture Decision Records (ADR)

[Abd-Standard]

Description

Introduce ADR documents to capture important technical decisions and the reasoning behind them.

Acceptance Criteria
ADR template is added.
Initial ADRs are created.
Documentation references ADRs.

[umarabubakarbio260-beep]

@umarabubakarbio260-beep has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I’ve reviewed the issue and can handle it; please assign it to me.

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