README.md updated

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@@ -3,4 +3,13 @@
 [![godoc.org](https://godoc.org/github.com/alexpevzner/goipp?status.svg)](http://godoc.org/github.com/alexpevzner/goipp)
 ![GitHub](https://img.shields.io/github/license/alexpevzner/goipp)
 
-IPP core protocol implementation in pure Go
+The goipp library is fairly complete implementation of IPP core protocol in
+pure Go. Essentially, it is  IPP messages parser/composer. Transport is
+not implemented here, because Go standard library has an excellent built-in
+HTTP client, and it doesn't make a lot of sense to wrap it here.
+
+High-level requests, like "print a file" are also not implemented, only the
+low-level stuff.
+
+All documentation is on godoc.org -- follow the link above. Pull requests
+are welcomed, assuming they don't break existing API.