Enable CI

.gitignore

+*.jar
+!gradle/wrapper/gradle-wrapper.jar
+!libs/*.jar
+.project
+.classpath
+.idea/
+.gradle/
+build/

.gitlab-ci.yml

+stages:
+- build
+
+before_script:
+  - export GRADLE_USER_HOME=`pwd`/.gradle
+
+cache:
+  paths:
+    - .gradle/wrapper
+    - .gradle/caches
+
+build:
+  image: openjdk:8
+  stage: build
+  script:
+    - ./gradlew --console=plain --no-daemon assemble jar
+  artifacts:
+    paths:
+      - "/builds/jastadd/ragconnect/build/libs/ragconnect-*.jar"