Add Dockerfile and instructions on how to use it in README.

.dockerignore

@@ -0,0 +1,3 @@
+.git
+node_modules
+build

Dockerfile

@@ -0,0 +1,14 @@
+FROM node:10.16.0-alpine
+
+RUN mkdir xrp-api
+WORKDIR /xrp-api
+ADD . /xrp-api
+
+RUN npm install -g -s --no-progress yarn
+RUN yarn
+RUN yarn run build
+RUN yarn cache clean
+
+EXPOSE 3000
+
+CMD ["yarn", "dev"]

README.md

@@ -100,3 +100,16 @@ In this simple tutorial, we will get our account's XRP balance, send a payment,
 
         curl -X GET \
           http://localhost:3000/v1/transactions/{TRANSACTION_ID}
+### Docker Container
+
+You can also run the service in a docker container using the Dockerfile in this repo.
+
+1. Be sure you have done the secret_config step from the Initial Setup section.
+2. Build the container.
+
+    ```docker build . -t <some_tag>```
+3. Run the container.
+
+   ```docker run -it -p 3000:3000 -v <path_to_secret_config>/.secret_config.js:/xrp-api/.secret_config.js <some_tag>```
+
+4. You should now be able to run the steps in the tutorial.