[#376] [DC] Implementation Flow. Add arch. template

docs/architectural-flow/README.md

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+# Fingrom Application Architecture
+
+[![License: CC BY-NC-ND 4.0](https://img.shields.io/badge/License-CC_BY--NC--ND_4.0-lightgrey.svg)](https://creativecommons.org/licenses/by-nc-nd/4.0/) 
+
+## Architectural Decision Records
+
+An architectural decision record (ADR) serves as a comprehensive document that outlines the significant choices made by 
+a team concerning the software architecture they intend to construct. Each ADR elucidates the specific architectural 
+decision, its contextual factors, and the anticipated consequences. These records are not static but rather dynamic, 
+mirroring a lifecycle that charts the evolution and impact of these decisions over time. They serve as a valuable 
+reference, capturing the rationale behind critical architectural choices and their effects on the overall system, 
+promoting transparency and understanding within the team.

docs/architectural-flow/decisions/000000_template.md

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+<!-- Compilation of: MADR Template, ADR GitHub, and AWS ADR process -->
+
+# Description of proposal
+**Status:** Proposed | Accepted | Rejected
+**Date:** YYYY-MM-DD
+**Author:** Author Name
+
+## Context and Problem Statement
+
+{Describe the context and problem statement, using two to three sentences}
+
+## Decision Drivers
+
+* {decision driver 1, e.g., a force, facing concern, …}
+* … 
+
+## Considered Options
+
+* {title of option 1}
+* … 
+
+## Decision Outcome
+
+In the context of <use case/user story u>, facing <concern c> we decided for <option o> and neglected <other options>, 
+to achieve <system qualities/desired consequences>, accepting <downside d/undesired consequences>,
+because <additional rationale>.
+
+
+### Consequences
+
+* Good, because {positive consequence, e.g., improvement of one or more desired qualities, …}
+* Bad, because {negative consequence, e.g., compromising one or more desired qualities, …}
+* …
+
+## Validation
+
+{describe how the implementation of/compliance with the ADR is validated. E.g., by a review or an ArchUnit test}
+
+
+## Pros and Cons of the Options
+
+### {title of option 1}
+
+{example | description | pointer to more information | …}
+
+* Good, because {argument a}
+* Good, because {argument b}
+* Neutral, because {argument c}
+* Bad, because {argument d}
+* … 
+
+### {title of other option}
+
+{example | description | pointer to more information | …}
+
+* Good, because {argument a}
+* Good, because {argument b}
+* Neutral, because {argument c}
+* Bad, because {argument d}
+* …
+
+## Notes
+
+…