Add rust extension

mcp.gemspec

@@ -34,8 +34,11 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
   spec.extensions = ["ext/mcp/extconf.rb"]
 
-  # Uncomment to register a new dependency of your gem
-  # spec.add_dependency "example-gem", "~> 1.0"
+  # needed until rubygems supports Rust support is out of beta
+  spec.add_dependency "rb_sys", "~> 0.9.39"
+
+  # only needed when developing or packaging your gem
+  # spec.add_development_dependency "rake-compiler", "~> 1.2.0"
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html