First stab at basic contribution and submission guidelines

CONTRIBUTING.md

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+# Contribution Guidelines
+
+## Submitting an Application to the Showcase
+
+Please submit a pull request to the [app repository](https://github.com/phonegap/app) and fill out the Pull Request template!
+
+## Filing Issues with the Site
+
+Go ahead and file an issue, providing as many reproduction details as possible!

PULL_REQUEST_TEMPLATE.md

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+# Submissions to the App Showcase
+
+If you'd like to share your application on the PhoneGap App Showcase, please
+follow this submission template to help expedite the review of your app.
+
+## Requirements
+
+We need to know the basics about your app. In particular:
+
+- [ ] App name
+- [ ] Your name or company name
+- [ ] Your email address (we may need to contact you about your submission)
+- [ ] Web address (for the app or for the app developer)
+- [ ] App description (no more than a few paragraphs)
+- [ ] App icon, 200px X 200px HiDPI
+- [ ] App store link(s)
+- [ ] At least two app screenshots (but no more than 3). You can reuse the ones you submitted to the app store(s)
+- [ ] Optionally, the URL to a video (YouTube, Vimeo for example)
+
+## Review Criteria
+
+Further, the following is a non-exhaustive list of criteria that the PhoneGap
+review team looks for in Showcase applications:
+
+- Is it an example of great design?
+- Is the app cross-platform -- meaning, is your app available on at least two of the Apple App Store, Google Play Store, or the Windows Store?
+- Does it have a great star rating in the app store(s)?
+- Is it an app with a relatively unique concept?
+- Is the app useful or impactful?
+- Does it contain some level of complexity, showing off what is possible with PhoneGap?