<commit_before>Example app showing using 3-factor OAuth2 to retrieve GitHub user emails.

#### Quick Start
##### Create a GitHub app
See https://developer.github.com/guides/basics-of-authentication/
##### Build
```$ mvn package```
##### Run
It's necessary to provide the client id and secret here. These can be specified in ```application.properties``` or on
the command line as arguments or as environment variables, etc.
```$ java -jar target/*jar --api.client_id=foo --api.client_secret=bar```
##### Use
- Load http://localhost:8080 and click "authorize"
- You should be redirected to a GitHub authentication page asking for access to read your email addresses
- Click Ok
- The app will then list your registered email addresses.<commit_msg>readme cleanup<commit_after>Example app showing using 3-factor OAuth2 to retrieve GitHub user emails.

#### Quick Start
##### Create a GitHub app
See https://developer.github.com/guides/basics-of-authentication/
##### Build

```$ mvn package```


##### Run
It's necessary to provide the client id and secret here. These can be specified in ```application.properties``` or on
the command line as arguments or as environment variables, etc.


```$ java -jar target/*jar --api.client_id=foo --api.client_secret=bar```


##### Use
- Load http://localhost:8080 and click "authorize"
- You should be redirected to a GitHub authentication page asking for access to read your email addresses
- Click Ok
- The app will then list your registered email addresses.
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