Added docker files.

Author: nero120

.dockerignore

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+.gitignore
+.travis.yml
+.vscode
+node_modules
+test

dockerfile

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+FROM node:8-slim
+
+# Set environment variables
+ENV XBROWSERSYNC_DB_USER ${XBROWSERSYNC_DB_USER}
+ENV XBROWSERSYNC_DB_PWD ${XBROWSERSYNC_DB_PWD}
+
+# Create api directory
+WORKDIR /usr/src/xbrowsersync-api
+
+# Copy src files
+COPY . .
+
+# Install dependencies
+RUN npm install
+
+# Expose port and start application
+EXPOSE 8080
+CMD [ "node", "dist/api.js"]