feat(readme): add detailed usage notes generated from each tool

Author: bethesque

packaging/README.md.template

@@ -14,11 +14,20 @@ This version (<%= ENV.fetch('VERSION') %>) of the Pact standalone executables pa
 
 ## Usage
 
-* Once the package has been extracted:
+### pact-mock-service
 
 ```
-cd pact/bin
-./pact-mock-service --help start # will display the options for the mock service
-./pact-provider-verifier --help verify # will display the options for the verifier
-./pact-publish --help # will display the options for publishing
+<%= pact_mock_service_usage %>
+```
+
+### pact-provider-verifier
+
+```
+<%= pact_provider_verifier_usage %>
+```
+
+### pact-publish
+
+```
+<%= pact_publish_usage %>
 ```

packaging/generate_readme_contents.rb

@@ -5,4 +5,7 @@
 require 'pact/provider_verifier/version'
 require 'pact_broker/client/version'
 
+pact_mock_service_usage = `bundle exec pact-mock-service help` + `bundle exec pact-mock-service help service`
+pact_provider_verifier_usage = `bundle exec pact-provider-verifier help`
+pact_publish_usage = `bundle exec pact-publish help`
 puts ERB.new(ARGF.read).result(binding)