Introduce ADRs for the project

adr/adr-process.md

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+# ADR Process
+
+## Overview
+
+When writing/maintaining software, developers often have to make architectural design decisions. In the BigBone project, 
+we use Architectural Decision Records (ADRs) to log the outcome of the decision-making process behind. ADRs are 
+typically created for design decisions that address a functional or non-functional requirement that is architecturally
+significant. Hence, we can view them as journals, akin to meeting outcome summaries or discussion notes. ADRs help 
+future developers to better understand why things are done in a particular way.
+
+## Process
+
+## ADR Creation
+
+The process for discussing architectural or design topics is initiated by first identifying a need for discussing it.
+Once the team has agreed that there is a real need for having an in-depth discussion, the process is initiated as
+follows:
+
+1. The initiator of the topic creates a new discussion thread under the "Architecture & Design" category. The topic is
+   discussed on the discussion thread and members agree on a decision to be taken.
+2. The outcome of the discussion should be recorded in a new ADR inside the `/adr` folder. Please use the provided 
+   template for this (`adr-template.md`). Give your ADR a meaningful name, such as `0001-exception-handling.md`. For
+   every future ADR, the number should be incremented by 1.
+3. Also please place a link in the discussion thread that points to the newly created ADR.
+4. If concrete action needs to be taken, please open issues for all of them and refer to the ADR.
+
+## ADR Review
+
+
+
+## More on ADRs
+
+- https://adr.github.io/
+- https://www.ozimmer.ch/practices/2023/04/03/ADRCreation.html
+- https://docs.aws.amazon.com/prescriptive-guidance/latest/architectural-decision-records/adr-process.html

adr/adr-template.md

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+# ADR <Four digit number>: <Title>
+
+## Status
+
+The status of this ADR. Valid statuses are:
+
+- Proposed: ADRs in the Proposed state are ready for review.
+- Accepted: An ADR which was accepted by the team.
+- Rejected: An ADR which was rejected by the team.
+- Superseded: An ADR which was replaced by a newer one.
+
+## Context
+
+What is the issue that we're seeing that is motivating this decision or change?
+
+## Decision
+
+What is the change that we're proposing and/or doing?
+
+## Consequences
+
+What becomes easier or more difficult to do because of this change?