added ruby library docs

docs/libraries/ruby.markdown

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+Open Photo API / Ruby Library
+=======================
+#### OpenPhoto, a photo service for the masses
+
+----------------------------------------
+
+<a name="install"></a>
+### Installation
+gem install openphoto-ruby
+
+<a name="ruby"></a>
+### How to use the library
+
+To use the library you need to first require 'openphoto-ruby', retrieve your OAuth credentials, then instantiate an instance of the client and start making calls.
+
+	require 'rubygems'
+	require 'openphoto-ruby'
+
+	@client = Openphoto::Client.new(@site, @consumer_key, @consumer_secret, @access_token, @access_token_secret)
+	photo = @client.connect(:post, "/photo/upload.json", {"photo"=>"/tmp/photo.png", "permission"=>"1", "title"=>"test upload"})
+	puts "#{photo.message} #{@site}/photo/#{photo.result["id"]}/view"
+
+----------------------------------------
+
+<a name="credentials"></a>
+#### Getting your credentials
+
+You can get your credentials by clicking on the arrow next to your email address once you're logged into your site and then clicking on settings.
+If you don't have any credentials then you can create one for yourself by going to `/v1/oauth/flow`.
+Once completed go back to the settings page and you should see the credential you just created
+
+----------------------------------------
+<a name="openphoto"></a>
+#### OpenPhoto installation and API documentation
+
+You can find more information at the main <a href="http://theopenphotoproject.org/documentation">OpenPhoto documentation page</a>.