First draft of implementation

Readme will follow

.github/workflows/ci.yaml

@@ -0,0 +1,70 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request: {}
+
+jobs:
+
+  yaml:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ibiqlik/action-yamllint@v3
+        with:
+          format: colored
+          strict: true
+
+  markdown:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: avto-dev/markdown-lint@v1
+        with:
+          args: /github/workspace
+
+  javadoc:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 17
+          cache: maven
+      - run: mvn -B -ntp dependency:go-offline
+      - run: mvn -B -ntp javadoc:javadoc-no-fork -Ddoclint=all
+
+  checkstyle:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 17
+          cache: maven
+      - run: mvn -B -ntp dependency:go-offline
+      - run: mvn -B -ntp checkstyle:check
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 17
+          cache: maven
+          server-id: sonatype-nexus
+          server-username: SERVER_USERNAME
+          server-password: SERVER_PASSWORD
+      - run: mvn -B -ntp dependency:go-offline
+      - run: mvn -B -ntp verify -Dcheckstyle.skip
+        if: ${{ github.ref != 'refs/heads/main' }}
+      - run: mvn -B -ntp deploy -Dcheckstyle.skip
+        if: ${{ github.ref == 'refs/heads/main' }}
+        env:
+          SERVER_USERNAME: ${{ secrets.SONATYPE_NEXUS_USERNAME }}
+          SERVER_PASSWORD: ${{ secrets.SONATYPE_NEXUS_PASSWORD }}