Create CI pipeline and mvn wrapper

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.yml]
+indent_size = 2
+
+[*.yaml]
+indent_size = 2

.github/workflows/ci.yml

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+name: CI Pipeline
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Setup Java 25
+        uses: actions/setup-java@v5.2.0
+        with:
+          distribution: 'temurin'
+          java-version: '25'
+          cache: 'maven'
+
+      - name: Run tests
+        run: ./mvnw -B test
+
+      - name: Run spotless checks
+        run: ./mvnw -B spotless:check

.mvn/wrapper/maven-wrapper.properties

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+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.7/apache-maven-3.8.7-bin.zip