add circleCI integration

.circleci/config.yml

@@ -0,0 +1,52 @@
+version: 2.0
+
+jobs:
+  build:
+    docker:
+      - image: circleci/node:10.9.0
+    working_directory: ~/react-plotly.js
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-deps-{{ .Branch }}-{{ checksum "package-lock.json" }}
+            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-deps-master-{{ checksum "package-lock.json" }}
+      - run:
+          name: Install dependencies
+          command: |
+            npm install
+      - run:
+          name: List dependency versions
+          command: |
+            echo "npm: $(npm --version)"
+            echo "node: $(node --version)"
+            npm ls || true
+      - save_cache:
+          paths:
+            - node_modules
+          key: v{{ .Environment.CIRCLE_CACHE_VERSION }}-deps-{{ .Branch }}-{{ checksum "package.json" }}
+      - persist_to_workspace:
+          root: .
+          paths:
+            - node_modules
+
+  test:
+    docker:
+      - image: circleci/node:10.9.0
+    working_directory: ~/react-plotly.js
+    steps:
+      - checkout
+      - attach_workspace:
+          at: ~/react-plotly.js
+      - run:
+          name: Run tests
+          command: npm run test
+
+workflows:
+  version: 2
+  build-and-test:
+    jobs:
+      - build
+      - test:
+          requires:
+            - build

.gitignore

@@ -4,6 +4,7 @@ npm-debug.log*
 *.sublime*
 
 .*
+!.circleci
 !.gitignore
 !.gitattributes
 !.npmignore