added circle ci (#237)

.circleci/config.yml

@@ -0,0 +1,46 @@
+# Java Gradle CircleCI 2.0 configuration file
+# See: https://circleci.com/docs/2.0/language-java/
+version: 2
+
+# Define a job to be invoked later in a workflow.
+# See: https://circleci.com/docs/2.0/configuration-reference/#jobs
+jobs:
+  build:
+    # Specify the execution environment. You can specify an image from Dockerhub or use one of our Convenience Images from CircleCI's Developer Hub.
+    # See: https://circleci.com/docs/2.0/configuration-reference/#docker-machine-macos-windows-executor
+    docker:
+      # specify the version you desire here
+      - image: circleci/openjdk:8-jdk
+
+      # Specify service dependencies here if necessary
+      # CircleCI maintains a library of pre-built images
+      # documented at https://circleci.com/docs/2.0/circleci-images/
+      # - image: circleci/postgres:9.4
+
+    working_directory: ~/repo
+
+    environment:
+      # Customize the JVM maximum heap limit
+      JVM_OPTS: -Xmx3200m
+      TERM: dumb
+    # Add steps to the job
+    # See: https://circleci.com/docs/2.0/configuration-reference/#steps
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+            - v1-dependencies-{{ checksum "build.gradle" }}
+            # fallback to using the latest cache if no exact match is found
+            - v1-dependencies-
+
+      - run: gradle dependencies
+
+      - save_cache:
+          paths:
+            - ~/.gradle
+          key: v1-dependencies-{{ checksum "build.gradle" }}
+
+      # run tests!
+      - run: gradle test