message: add 'Using Docker' section to readme
diff: @@ -108,6 +108,26 @@ adb push tests/tests /data/local/tmp
  adb shell /data/local/tmp/tests
  ```
  +## Using Docker
  +
  +The `Dockerfile` included in this repo will provision a Docker image suitable
  +for building and running tests for both the Linux and Android platforms.
  +
  +```
  +# Build Docker image from Dockerfile
  +docker build -t "objectstore" .
  +# Run bash interactively from the built Docker image,
  +# mounting the current directory
  +docker run -it -v `pwd`:`pwd` -w `pwd` objectstore bash
  +# Build the object store for Linux and run tests
  +> cmake .
  +> make
  +> make run-tests
  +```
  +
  +Refer to the rest of this document for instructions to build/test in other
  +configurations.
  +
  ## License
  Realm Object Store is published under the Apache 2.0 license. The [underlying core](https://github.com/realm/realm-core) is also published under the Apache 2.0 license.
  