add README.

README.md

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+# aws-ips
+check network addresses for AWS Services
+
+[![Build Status](https://www.travis-ci.org/jonhadfield/aws-ips.svg?branch=master)](https://www.travis-ci.org/jonhadfield/aws-ips) [![Go Report Card](https://goreportcard.com/badge/github.com/jonhadfield/aws-ips)](https://goreportcard.com/report/github.com/jonhadfield/aws-ips)
+
+## about
+
+AWS publish a list of IP ranges that correspond to their services and regions. Linked to from [here](https://docs.aws.amazon.com/general/latest/gr/aws-ip-ranges.html).
+
+## features
+
+- list and filter prefixes (by region, service, cidr)
+- reverse lookup of IP address or FQDN to AWS range
+- output results as JSON, YAML, or Text
+
+## changelog
+0.0.1 - initial
+
+## installation
+Download the latest release here: https://github.com/jonhadfield/aws-ips/releases
+
+#### macOS and Linux
+
+Install:  
+``
+$ install <aws-ips binary> /usr/local/bin/aws-ips
+``  
+#### Windows
+
+An installer is planned, but for now...  
+Download the binary 'aws-ips_windows_amd64.exe' and rename to aws-ips.exe
+
+### commands and options:  
+``
+$ aws-ips --help
+``
+
+
+