If you have an application that you wish to submit to the Web Application Gallery , here’s some info to help you understand the submission process :
Step#1 : Review Web App Gallery Principles which are the basic requirements that you need to understand before submitting an application .
Step#2 : Build a package for your application for Web App Gallery with these guidelines. You need to test the application for App Gallery before submitting . Here are some video tutorials that shows what the App Gallery team tests for :