Updated the README.md page to announce the availability of pre-release versions of LocalRadio, with a link.

Author: dsward2

README.md

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+### The latest pre-release alpha versions of the LocalRadio app are [avaiable for download at this link](https://github.com/dsward2/LocalRadio/releases).
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 **LocalRadio** is an experimental, GPL-2 licensed open-source application for listening to "software defined radio" on your Mac and mobile devices.  With an inexpensive RTL-SDR device plugged into the Mac's USB port, LocalRadio provides a casual listening experience for your favorite local FM broadcasts, free music, news, sports, weather, public safety and aviation scanner monitoring, and other radio sources.  
 
 LocalRadio's easy-to-use web interface allows the radio to be shared from a Mac to iPhones, iPads, Android devices, and other PCs on your home network.  No additional software or hardware is required for sharing with mobile devices, simply use the built-in mobile web browser to connect to LocalRadio and tune to your favorite stations.  You can also listen to LocalRadio audio on your Apple TV and other AirPlay-compatible devices.