Initial commit

This adds a rudimentary `chaos` package for querying broadband info, and
a Prometheus exporter.

README.md

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+# Andrews and Arnold CHAOS API
+
+The `chaos` package allows interacting with the [Andrews and Arnold](https://aa.net.uk) CHAOS API.
+
+Implemented features:
+
+[x] Broadband info
+[x] Broadband quota
+[ ] Broadband PPP kill
+[ ] Broadband ordering
+[ ] Broadband availability checker
+[ ] Broadband ordering
+[ ] Login info
+[ ] Login adjustment