NO-JIRA: chore(docs/adr): begin recording architectural decisions made on this project with the help of adr-tools (#858)

```
$ brew install adr-tools
$ adr init docs/architecture/decisions
```

* clarify not-using of opendatahub ADR repository and provide reasoning based on prior experience

Author: jiridanek

.adr-dir

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+docs/architecture/decisions

docs/architecture/decisions/0001-record-architecture-decisions.md

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+# 1. Record architecture decisions
+
+Date: 2025-01-18
+
+## Status
+
+Accepted
+
+## Context
+
+We need to record the architectural decisions made on this project.
+
+## Decision
+
+We will use Architecture Decision Records, as [described by Michael Nygard](http://thinkrelevance.com/blog/2011/11/15/documenting-architecture-decisions).
+
+We will presently ignore the [opendatahub-io/architecture-decision-records](https://github.com/opendatahub-io/architecture-decision-records)
+repository, since our ADRs are (at least initially) be internal to the notebooks project itself and also because
+previous experience ([PR#91](https://github.com/opendatahub-io/architecture-decision-records/pull/91))
+shows that it is challenging to get merge approval for a PR there.
+
+## Consequences
+
+See Michael Nygard's article, linked above. For a lightweight ADR toolset, see Nat Pryce's [adr-tools](https://github.com/npryce/adr-tools).

docs/architecture/decisions/README.md

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+## Getting started
+
+* <https://github.com/npryce/adr-tools>, installation:
+[Linux](https://github.com/npryce/adr-tools/blob/master/INSTALL.md#from-a-release-package-linux-macos-x),
+[Homebrew](https://formulae.brew.sh/formula/adr-tools)
+
+```commandline
+brew install adr-tools
+```
+
+## Start new ADR
+
+<https://github.com/npryce/adr-tools?tab=readme-ov-file#quick-start>
+
+```commandline
+adr new Implement as Unix shell scripts
+```
+
+## Initialize new ADR directory
+
+```commandline
+adr init docs/architecture/decisions
+```
+
+## OpenDataHub ADRs
+
+<https://github.com/opendatahub-io/architecture-decision-records>