If you developed a device powered by Android and you want to add it to Android Market, then read this page:
Basically you should follow these steps:
1) Obtain the Android software source code. This is the source code for the Android platform, that you port to your hardware.
2) Comply with Android Compatibility Definition Document (CDD). The CDD enumerates the software and hardware requirements of a compatible Android device.
3) Pass the Compatibility Test Suite (CTS). You can use the CTS (included in the Android source code) as an ongoing aid to compatibility during the development process.
You could download the Compatibility Definition from here:
Finally you could contact Android Compatibility from here: