re-add circlci config

Author: adamint

.circleci/config.yml

@@ -0,0 +1,14 @@
+version: 2
+jobs:
+  build:
+    working_directory: ~/spotify-web-api-kotlin
+    docker:
+      - image: gradle
+    steps:
+      - checkout
+      - run:
+          name: Download Dependencies
+          command: ./gradlew androidDependencies
+      - run:
+          name: Run Tests
+          command: ./gradlew test -PclientId=$SPOTIFY_CLIENT_ID -PclientSecret=$SPOTIFY_CLIENT_SECRET