Add a README.

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# Prometheus Unbound exporter
This repository provides code for a simple Prometheus metrics exporter
for [the Unbound DNS resolver](https://unbound.net/). This exporter
connects to Unbounds TLS control socket and sends the `stats_noreset`
command, causing Unbound to return metrics as key-value pairs. The
metrics exporter converts Unbound metric names to Prometheus metric
names and labels by using a set of regular expressions.
Please refer to this utility's `main()` function for a list of supported
command line flags.