Add Circle CI configuration

Issue: tiliado/nuvolaplayer#420

.circleci/config.yml

@@ -0,0 +1,13 @@
+version: 2
+jobs:
+  build:
+    machine: # for docker --privileged
+      image: circleci/classic:latest
+    working_directory: ~/workdir
+    steps:
+      - checkout
+      - run: 
+          name: Install deps & check project
+          command: wget https://raw.githubusercontent.com/tiliado/nuvolasdk/master/scripts/circleci.sh && chmod a+x circleci.sh && ./circleci.sh
+      - store_artifacts:
+          path: ~/workdir/keep

README.md

@@ -1,4 +1,4 @@
-ownCloud Music • Nuvola Apps Runtime
+ownCloud Music • Nuvola Apps Runtime [![CircleCI](https://circleci.com/gh/tiliado/nuvola-app-owncloud-music/tree/master.svg?style=svg)](https://circleci.com/gh/tiliado/nuvola-app-owncloud-music/tree/master)
 ====================================
 
 Integration of ownCloud Music into your linux desktop via