Updated Readme 
Updated Readme 

Added section about using just the binaries. Updated the section about building from source to instruct how to build and use FANNCSharp in 4 different ways. Added a link to the documentation.
joelself/FANNCSharpCore,joelself/FANNCSharpCore,joelself/FannCSharp,joelself/FannCSharp,joelself/FANNCSharpCore,joelself/FannCSharp,joelself/FANNCSharpCore,joelself/FannCSharp,joelself/FannCSharp,joelself/FANNCSharpCore