add url proxy (#109)

url/proxy/README.md

@@ -0,0 +1,15 @@
+# URL Proxy
+
+The URL proxy provides the single entrypoint for m3o.one
+
+## Overview
+
+The [url](https://github.com/micro/services) service provides link shortening and sharing. The URL Proxy fronts those urls 
+as a single entrypoint at https://m3o.one. We don't serve directly because of time wasted on ssl certs, etc.
+
+## Usage
+
+- Assumes url is of format `https://m3o.one/u/AArfeZE`
+- Will call `https://api.m3o.com/url/proxy?shortURL=AArfeZE`
+- URL service should return `destinationURL=https://foobar.com/example`
+- Proxy will issue a 301 redirect