There are certain things that you need to keep in mind when you consider submitting an application to Marketplace. If you wish to submit your application as a hosted application, then you need to make sure that the MIME type of the manifest file is served correctly (they should be be served with this Content-Type header of application/x-web-app-manifest+json). However, if you wish to submit your application as a packaged application, then you will need to compress the application in the .zip format.
Note
One common mistake that people make is that they zip the folder which contains the source code of their application. Don't make that mistake, or else your application won't pass the validation test. Remember, the manifest file should be at the root level of your zipped file.
Let's submit our application now. First of all, let's compress our application; users of OS X can do so by selecting all the files and folders, and right-clicking to select...