Add Circle CI config

.circleci/config.yml

@@ -0,0 +1,22 @@
+# PHP CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-php/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/php:7.1.5-browsers
+    working_directory: ~/repo
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum 'composer.json' }}
+          - v1-dependencies-
+      - run: composer install -n --prefer-dist
+      - save_cache:
+          paths:
+            - ./vendor
+          key: v1-dependencies-{{ checksum 'composer.json' }}
+      - run: ./vendor/bin/phpunit