Add readme file for extended HATA implementation.
Add readme file for extended HATA implementation.

gregbillock/Spectrum-Access-System,krlinus/Spectrum-Access-System,gregbillock/Spectrum-Access-System,Wireless-Innovation-Forum/Spectrum-Access-System,krlinus/Spectrum-Access-System,krlinus/Spectrum-Access-System,krlinus/Spectrum-Access-System,gregbillock/Spectrum-Access-System,Wireless-Innovation-Forum/Spectrum-Access-System,gregbillock/Spectrum-Access-System,Wireless-Innovation-Forum/Spectrum-Access-System,Wireless-Innovation-Forum/Spectrum-Access-System