Added workflow config for builds on PR

Closes gh-16

.github/workflows/pr-build-workflow.yml

@@ -0,0 +1,24 @@
+name: PR build
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Build
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        jdk: [8,9,10,11,12,14]
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK ${{ matrix.jdk }}
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.jdk }}
+      - name: Build with Gradle
+        run: ./gradlew clean build

README.adoc

@@ -1,6 +1,6 @@
 image::https://badges.gitter.im/Join%20Chat.svg[Gitter,link=https://gitter.im/spring-projects/spring-security?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge]
 
-image:https://travis-ci.org/spring-projects-experimental/spring-authorization-server.svg?branch=master["Build Status", link="https://travis-ci.org/spring-projects-experimental/spring-authorization-server"]
+image:https://github.com/spring-projects-experimental/spring-authorization-server/workflows/CI/badge.svg?branch=master["Build Status", link="https://github.com/spring-projects-experimental/spring-authorization-server/actions?query=workflow%3ACI"]
 
 = Spring Authorization Server