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Add a bit more to the readme #625

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Apr 22, 2017
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Add a bit more to the readme #625

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38 changes: 38 additions & 0 deletions README.md
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This is a repository that contains java code snippets on [Cloud Platform Documentation](https://cloud.google.com/docs/).

The repo is organized as follows:

* [App Engine Standard](appengine)
* [TaskQueue](taskqueue) <!-- shouldn't this be in appengien ?? -->
* [Unit Tests](unittests)
* [App Engine Flexible](flexible)
* [Compute Engine](compute)

Technology Samples:

* [Bigquery](bigquery)
* [Datastore](datastore)
* [Endpoints](endpoints)
* [Key Management Service](kms)
* [Logging](logging)
* [Monitoring](monitoring)
* [Natural Language](language)
* [PubSub](pubsub)
* [Cloud Spanner](spanner)
* [Speech](speech)
* [Cloud Storage](storage)
* [Translate](translate)
* [Vision](vision)

## Credentials Example

The documentation for [Application Default Credentials](https://developers.google.com/identity/protocols/application-default-credentials).

`BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();`

The client library looks for credentials using the following rules:

1. `GOOGLE_APPLICATION_CREDENTIALS` environment variable, pointing to a service account key JSON file path.
2. Cloud SDK credentials `gcloud auth application-default login`
3. App Engine standard environment credentials.
4. Compute Engine credentials.

You can override this behavior using setCredentials in `BigQueryOptions.newBuilder()` by adding `setCredentials(Credentials credentials)` from [ServiceOptions.builder](http://googlecloudplatform.github.io/google-cloud-java/0.12.0/apidocs/com/google/cloud/ServiceOptions.Builder.html#setCredentials-com.google.auth.Credentials-) and [Credentials](http://google.github.io/google-auth-library-java/releases/0.6.0/apidocs/com/google/auth/Credentials.html?is-external=true).