adds contributing guidelines

CONTRIBUTING.md

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+# How to Contribute to SelectorHound
+
+## Did you find a bug?
+
+1. Check and see if it's already been reported under [issues](https://github.com/paceaux/selector-finder/issues).
+    * Add your own comments to the issue if you have more information to add
+    * Exact parameters you passed in
+    * Relevant excerpts from your log.txt file
+
+2. If it hasn't been reported, [open a new issue](https://github.com/paceaux/selector-finder/issues/new)
+    * Include a title and clear description
+    * Include the exact parameters you passed in
+    * include a sample of the output from your log.txt file
+    * Include your version of node and npm
+
+## Would you like a new feature?
+
+1. Check [our enhancements](https://github.com/paceaux/selector-finder/labels/enhancement).
+2. If yours isn't there, open a new issue and set the label as "enhancement";
+    * Use the title to explain in 1 sentence what you're looking for
+    * In the description, explain in a few bullet points:
+        * How a developer would know the feature has been delivered
+        * What the motivation is for this feature?
+
+## Would you like to contribute to this?
+
+0. Find an issue that you'd like to work on
+1. Clone this repository
+2. Make a branch off of `develop` labeled `[issue number]-[short description]`
+3. Do your work
+4. JSDoc your code
+5. Write unit tests
+6. Run the linter
+7. Submit a PR to `develop`
+8. Include how you tested the CLI
+9. Indicate whether this is a patch, minor, or major change
+
+### What happens after your PR is approved?
+
+1. It will be merged into `develop`
+2. The maintainers will run tests and test the CLI with more  examples
+3. They may or may not include additional issues in the merge to develop
+4. When develop is ready for a release, a maintainer will increment the package version and merge it into `master`
+5. The maintainer will tag the release in `master` and push it to npm