update readme with testing section

Author: dpopp07

README.md

@@ -134,6 +134,18 @@ There have been a few breaking changes in recent releases:
 
 See [CHANGELOG.md](CHANGELOG.md) for a complete list of changes.
 
+## Development
+
+### Testing
+The test suite is broken up into offline unit tests and integration tests that test against actual service instances.
+* `npm test` will run the linter and the offline tests
+* `npm run test-offline` will run the offline tests
+* `npm run test-integration` will run the integration tests
+
+To run the integration tests, a file with service credentials is required. This file must be called `stt-auth.json` and must be located in `/test/resources/`. There are tests for usage of both CF and RC service instances. For testing CF, the required keys in this configuration file are `username` and `password`. For testing RC, a key of either `iam_acess_token` or `iam_apikey` is required. Optionally, a service URL for an RC instance can be provided under the key `rc_service_url` if the service is available under a URL other than `https://stream.watsonplatform.net/speech-to-text/api`.
+
+For an example, see `test/resources/stt-auth-example.json`.
+
 ## todo
 
 * Further solidify API

test/resources/stt-auth-example.json

@@ -0,0 +1,6 @@
+{
+  "username": "<your-cf-username>",
+  "password": "<your-cf-password>",
+  "iam_apikey": "<your-rc-apikey>",
+  "rc_service_url": "<your-optional-rc-service-url>"
+}