Adding api scripts

This PR contains a new module called `api-explorer`. The module contains a bunch of groovy script to be used to explore the Github API according to the needs. Think about these as a set of simple cURL scripts, but fancier, and on steroids.

You need to provide your credential in a properties file in order to run the scripts. The file need to be in the root folder of the project, and will look like this:
```bash
clientId=GERTHERB_CLIENT_ID
clientSecret=GERTHERB_CLIENT_SECRET
username=GITHUB_USERNAME
password=GITHUB_PASSWORD
```

ATM only two simple scripts are provided in the `api-exporer/src/main/groovy/com/gertherb/api` folder.
To run one of them just right-click from ASide, they contain a already setup `main`

I tried my best to have a nice looking output, but there is large room for improvements.

NOTE: to fill correctly the property file, feel free to contact me to get the correct client id and secret for Gertherb. Username and password are from you personal Github account instead.