Add first version of the project.

.github/workflows/maven-publish.yml

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+name: Publish to Maven Central
+on:
+  release:
+    types: [ created ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up for publishing to Maven Central Repository
+        uses: actions/setup-java@v3
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+          server-id: ossrh
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
+          gpg-private-key: ${{ secrets.GPG_SIGNING_KEY }}
+          gpg-passphrase: MAVEN_GPG_PASSPHRASE
+
+      - name: Publish to Maven Central Repository
+        run: mvn --batch-mode deploy -Prelease -DskipTests
+        env:
+          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
+          MAVEN_GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}

.github/workflows/system-tests.yml

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+name: System tests
+on: [ push, pull_request_target ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out
+        uses: actions/checkout@master
+
+      - name: Set up
+        uses: actions/setup-java@master
+        with:
+          java-version: '21'
+          distribution: 'temurin'
+
+      - name: Build project
+        run: mvn -B -Pcoverage verify
+
+      - name: Run Snyk to check for vulnerabilities
+        uses: snyk/actions/maven@master
+        continue-on-error: true
+        env:
+          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+        with:
+          args: --sarif-file-output=snyk.sarif --include-provided-dependencies=false
+
+      - name: Upload result to GitHub Code Scanning
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: snyk.sarif

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Maven with auto-import
+.idea/artifacts
+.idea/compiler.xml
+.idea/jarRepositories.xml
+.idea/modules.xml
+.idea/*.iml
+.idea/modules
+*.iml
+*.ipr
+
+### OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db