improve Ruby docs

ruby/README.md

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+# Gilded Rose starting position in Ruby
+
+## Installation
+
+
+## Run the unit tests from the Command-Line
+
+Ensure you have RSpec installed
+
+    gem install rspec
+
+```
+ruby gilded_rose_spec.rb
+```
+
+## Run the TextTest fixture from the Command-Line
+
+For e.g. 10 days:
+
+```
+ruby texttest_fixture.rb 10
+```
+
+You should make sure the command shown above works when you execute it in a terminal before trying to use TextTest (see below).
+
+## Run the TextTest approval test that comes with this project
+
+There are instructions in the [TextTest Readme](../texttests/README.md) for setting up TextTest. You will need to specify the Ruby executable and interpreter in [config.gr](../texttests/config.gr). Uncomment these lines:
+
+    executable:${TEXTTEST_HOME}/ruby/texttest_fixture.rb
+    interpreter:ruby