add travis config file

.travis.yml

@@ -0,0 +1,18 @@
+language: java
+
+jdk:
+  - oraclejdk9
+
+services:
+  - docker
+
+
+before_install:
+  - docker pull jboss/keycloak:4.5.0.Final
+  - docker run -d -e KEYCLOAK_USER=admin -e KEYCLOAK_PASSWORD=admin -e KEYCLOAK_IMPORT=/tmp/elastic-realm-export.json -v "$(TRAVIS_BUILD_DIR)"/src/test/resources/config/elastic-realm-export.json:/tmp/elastic-realm-export.json jboss/keycloak:4.5.0.Final
+
+install:
+  - ./gradlew assemble
+
+script:
+  - ./gradlew check