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Update README.md (#141)

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Add instructions for environment variables.
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Shiyason authored and Graham Paye committed 2018-07-12 12:20:30 -07:00
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@@ -143,6 +143,15 @@ authorizer = Google::Auth::ServiceAccountCredentials.make_creds(
authorizer.fetch_access_token!
```
### Example (Environment Variables)
```bash
export GOOGLE_ACCOUNT_TYPE=service_account
export GOOGLE_CLIENT_ID=000000000000000000000
export GOOGLE_CLIENT_EMAIL=xxxx@xxxx.iam.gserviceaccount.com
export GOOGLE_PRIVATE_KEY="-----BEGIN PRIVATE KEY-----\n...\n-----END PRIVATE KEY-----\n"
```
### Storage
Authorizers require a storage instance to manage long term persistence of