Add a gemspec and support loading ffi as a gem

netlinkrb.gemspec

@@ -0,0 +1,17 @@
+# encoding: utf-8
+
+lib = File.expand_path("../lib", __FILE__)
+$:.unshift lib unless $:.include? lib
+
+Gem::Specification.new do |s|
+  s.name = "netlinkrb"
+  s.version = "0.10"
+  s.platform = Gem::Platform::RUBY
+  s.authors = ["Brian Candler", "Patrick Cherry", "Alex Young"]
+  s.email = ["matthew@bytemark.co.uk"]
+  s.summary = "Interface to Linux' Netlink API"
+  s.description = "Ruby native interface to the Netlink API which avoids shelling out to command-line tools as much as possible."
+  s.files = Dir["{lib,examples}/**/*"] + %w{README}
+  s.require_path = "lib"
+  s.add_dependency "ffi"
+end