docs(readme): Add README

Author: jeffjensen

README.adoc

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+= java-service-archetype
+
+Maven archetype that generates a structured multi-module Java service project.
+You describe your integrations, service areas, and presentation architectural tiers at generation time;
+the archetype builds the full module tree and wires up the parent POM.
+
+== Generate a Project
+
+[source,bash]
+----
+./mvnw archetype:generate \
+  -DarchetypeGroupId=io.github.jeffjensen \
+  -DarchetypeArtifactId=java-service-archetype \
+  -DarchetypeVersion=1.0.0-SNAPSHOT
+----
+
+See the https://jeffjensen.github.io/java-service-archetype/[project site] for the full prompts reference, module structure, examples, and build instructions.
+
+== CI / CD
+
+Three GitHub Actions workflows are included.
+
+=== Build any branch (`build-any-branch.yml`)
+
+Runs `./mvnw clean verify` on every push and pull request.
+Pushes to `main` automatically trigger the snapshot deploy and site publish workflows.
+Documentation-only changes (`.adoc`, `.md`, `src/site/**`) are skipped.
+
+=== Deploy snapshot (`deploy-snapshot.yml`)
+
+Triggered when the build workflow succeeds on `main`.
+Publishes a `-SNAPSHOT` artifact to Maven Central (Sonatype).
+Release versions (without `-SNAPSHOT`) are skipped automatically.
+
+Required repository secrets:
+
+[cols="1,2"]
+|===
+|Secret |Description
+
+|`CENTRAL_USERNAME` |Maven Central portal username
+|`CENTRAL_TOKEN`    |Maven Central portal token
+|===
+
+=== Publish site (`publish-docs.yml`)
+
+Triggered when the build workflow succeeds on `main`, or manually via `workflow_dispatch`.
+Runs `./mvnw site` and publishes the Maven site to GitHub Pages.
+
+Enable GitHub Pages (repository Settings → Pages → Source: *GitHub Actions*) before the first run.