Added Docker support

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:latest
+
+WORKDIR /opt/magic_mirror
+COPY . .
+COPY /modules unmount_modules
+COPY /config unmount_config
+
+ENV NODE_ENV production
+ENV MM_PORT 8080
+
+RUN npm install
+RUN ["chmod", "+x", "docker-entrypoint.sh"]
+
+EXPOSE $MM_PORT
+ENTRYPOINT ["/opt/magic_mirror/docker-entrypoint.sh"]