add package cache to config.yml for both services

.circleci/config.yml

@@ -0,0 +1,41 @@
+# JavaScript Node CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-javascript/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      # specify the version you desire here
+      - image: circleci/node:7.10
+
+      # 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/mongo:3.4.4
+
+    working_directory: ~/node-go
+
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+            - v1-server-dependencies-{{ checksum "server/package.json" }}
+            - v1-play-dependencies-{{ checksum "play-node-go/package.json" }}
+            # fallback to using the latest cache if no exact match is found
+            - v1-server-dependencies-
+            - v1-play-dependencies-
+
+      - run: yarn install
+
+      - save_cache:
+          paths:
+            - node_modules
+          keys: 
+            - v1-server-dependencies-{{ checksum "package.json" }}
+            - v1-play-dependencies-{{ checksum "play-node-go/package.json" }}
+
+      # run tests!
+      - run: yarn test