State in README our contributors policy and supported rubies.

README.md

@@ -40,11 +40,62 @@ Starting from version `0.1.0` this gem follows [semantic versioning](http://semv
 Contributing
 ------------
 
-Once you've made your great commits:
+In the spirit of [free software][free-sw], **everyone** is encouraged to help
+improve this project.
 
-1. Fork m2r
-2. Create a topic branch - `git checkout -b my_branch`
-3. Push to your branch - `git push origin my_branch`
-4. Send a pull request
+[free-sw]: http://www.fsf.org/licensing/essays/free-sw.html
 
+Here are some ways *you* can contribute:
+
+* by using alpha, beta, and prerelease versions
+* by reporting bugs
+* by suggesting new features
+* by writing or editing documentation
+* by writing tests
+* by writing code (**no patch is too small**: fix typos, add comments, clean up
+  inconsistent whitespace)
+* by refactoring code
+* by closing [issues][]
+* by reviewing patches
+
+[issues]: https://github.com/perplexes/m2r/issues
+
+Submitting an Issue
+-------------------
+
+We use the [GitHub issue tracker][issues] to track bugs and features. Before
+submitting a bug report or feature request, check to make sure it hasn't
+already been submitted. When submitting a bug report, please include a [Gist][]
+that includes a stack trace and any details that may be necessary to reproduce
+the bug, including your gem version, Ruby version, and operating system.
+Ideally, a bug report should include a pull request with failing tests.
+
+[gist]: https://gist.github.com/
+
+Submitting a Pull Request
+-------------------------
+
+1. [Fork the repository.][fork]
+2. [Create a topic branch.][branch]
+3. Add tests for your unimplemented feature or bug fix.
+4. Run `bundle exec rake`. If your test pass, return to step 3.
+5. Implement your feature or bug fix.
+6. Run `bundle exec rake`. If your tests fail, return to step 5.
+7. Add, commit, and push your changes.
+8. [Submit a pull request.][pr]
+
+[fork]: http://help.github.com/fork-a-repo/
+[branch]: http://learn.github.com/p/branching.html
+[pr]: http://help.github.com/send-pull-requests/
+
+
+Supported Ruby Versions
+-----------------------
+
+This library aims to support and is [tested against](http://travis-ci.org/perplexes/m2r) the following Ruby implementations:
+
+- Ruby 1.9.2
+- Ruby 1.9.3
+- JRuby
+- Rubinius