GH-5: Add architectural decision record for CMS backend

docs/adr/20241203-cms-backend.md

@@ -0,0 +1,65 @@
+# CMS Backend Selection
+
+## Context and Problem Statement
+
+## Decision Drivers
+
+- Ability to run locally
+- Ability to commit content to GitHub
+- Ability to access content through API (a.k.a Headless CMS)
+- Valuable showcase for other job opportunities that require the CMS
+
+## Considered Options
+
+- Contentful
+- WordPress
+- PayloadCMS
+
+## Decision Outcome
+
+### Positive Consequences <!-- optional -->
+
+- …
+
+### Negative Consequences <!-- optional -->
+
+- [e.g., compromising quality attribute, follow-up decisions required, …]
+- …
+
+## Pros and Cons of the Options <!-- optional -->
+
+### Contentful
+
+[example | description | pointer to more information | …] <!-- optional -->
+
+- Good, because data is managed through the cloud
+- Good, because it is feature-rich
+- Bad, because it requires payment to access all features
+- Bad, because it requires extra effort to handle authentication
+- … <!-- numbers of pros and cons can vary -->
+
+### WordPress
+
+[example | description | pointer to more information | …] <!-- optional -->
+
+- Good, because [argument a]
+- Good, because [argument b]
+- Bad, because [argument c]
+- … <!-- numbers of pros and cons can vary -->
+
+### PayloadCMS
+
+[example | description | pointer to more information | …] <!-- optional -->
+
+- Good, because [argument a]
+- Good, because [argument b]
+- Bad, because [argument c]
+- … <!-- numbers of pros and cons can vary -->
+
+## Links <!-- optional -->
+
+- [Contentful](https://www.contentful.com/)
+
+<!-- example: Refined by [ADR-0005](0005-example.md) -->
+
+- … <!-- numbers of links can vary -->