docs: add decision record about template repo (#194)

developer/decision-records/2024-08-16-new-template-repo/README.md

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+# Creation of a template repository for EDC adoption projects
+
+## Decision
+
+The EDC project will provide a _template repository_ for easy adoption. This template will show how to build an EDC runtime, using Hashicorp Vault and PostgreSQL persistence. It will also contain an exemplary custom extension. 
+
+## Rationale
+
+With the large number of modules the EDC project publishes, creating a custom launcher or app that uses them correctly
+may seem like a daunting task at times.
+To make it easier for adopters to get started, we'll provide a [GitHub Template Repository](https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-template-repository).
+
+## Approach
+
+The template repository will contain:
+- a launcher, based on Hashicorp Vault and PostgreSQL
+- minimal configuration
+- a get-started guide
+- some basic CI/CD workflows
+- an exemplary custom extension
+
+_For this, we will re-purpose the [Template-Basic](https://github.com/eclipse-edc/Template-Basic) repository that we already have, and that didn't really get used so far.