Initial Contributing Guidelines

CONTRIBUTING.md

@@ -0,0 +1,60 @@
+# Contributing
+
+Thanks for using and improving `HTML::Pipeline`!
+
+- [Submitting a New Issue](#submitting-a-new-issue)
+- [Sending a Pull Request](#sending-a-pull-request)
+
+## Submitting a New Issue
+
+If there's an idea you'd like to propose, or a design change, feel free to file a new issue. 
+
+If you have an implementation question or believe you've found a bug, please provide as many details as possible:
+
+- Input document
+- Output HTML document
+- the exact `HTML::Pipeline` code you are using
+- output of the following from your project
+
+```
+ruby -v
+bundle exec nokogiri -v
+```
+
+## Sending a Pull Request
+
+[Pull requests][pr] are always welcome!
+
+Check out [the project's issues list][issues] for ideas on what could be improved.
+
+Before sending, please add tests and ensure the test suite passes.
+
+### Running the Tests
+
+To run the full suite:
+
+  `bundle exec rake`
+
+To run a specific test file:
+
+  `bundle exec ruby -Itest test/html/pipeline_test.rb`
+
+To run a specific test:
+
+  `bundle exec ruby -Itest test/html/pipeline/markdown_filter_test.rb -n test_disabling_gfm`  
+
+To run the full suite with all [supported rubies][travisyaml] in bash:
+
+```bash
+rubies=(ree-1.8.7-2011.03 1.9.2-p290 1.9.3-p429 2.0.0-p247)
+for r in ${rubies[*]} 
+do 
+  rbenv local $r # switch to your version manager of choice
+  bundle install 
+  bundle exec rake 
+done
+```
+
+[issues]: https://github.com/jch/html-pipeline/issues
+[pr]: https://help.github.com/articles/using-pull-requests
+[travisyaml]: https://github.com/jch/html-pipeline/blob/master/.travis.yml