rake: task to run Cucumber; readme: running tests

README.md

@@ -35,6 +35,14 @@ Print liturgical calendar for the current month:
 
 `$ calrom 2028-01-15`
 
+## Running tests
+
+Clone the repository, `$ bundle install` to install dependencies, then:
+
+`$ rake cucumber` - run specs describing the command line interface
+
+`$ rake spec` - run specs describing internal implementation details
+
 ## Project roadmap
 
 * [ ] detailed listing of a day/month/year/range of dates

Rakefile

@@ -1,6 +1,9 @@
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
+require "cucumber/rake/task"
 
 RSpec::Core::RakeTask.new(:spec)
 
+Cucumber::Rake::Task.new
+
 task :default => :spec