Add GitHub workflows

.github/workflows/verify.yaml

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+#
+# Copyright (c) 2017 Angelo Zerr and other contributors as
+# indicated by the @author tags.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: Linux & Windows CI
+
+on: [push, pull_request]
+
+jobs:
+  linux:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        java: [ 8, 11, 14 ]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up JDK
+      uses: actions/setup-java@v1
+      with:
+        java-version: ${{ matrix.java }}
+    - name: Build with Maven
+      run: ./mvnw clean verify -B -ntp
+  windows:
+    runs-on: windows-2019
+    strategy:
+      matrix:
+        java: [ 8, 11, 14 ]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up JDK
+      uses: actions/setup-java@v1
+      with:
+        java-version: ${{ matrix.java }}
+    - name: Build with Maven
+      run: ./mvnw clean verify -B -ntp