The SDK contains source code for Windows Phone platform.
Pre-built SDK is located in:
For WP7: PushSDK/SDKBuild/WP7
For WP8: PushSDK/SDKBuild/WP7
The guilde for SDK integration is available on Pushwoosh website:
http://www.pushwoosh.com/programming-push-notification/windows-phone/windows-phone-sdk-configuration-guide/
The sample project is available here:
https://github.com/shaders/pushwoosh-sdk-samples/tree/master/WP8
Pushwoosh team
http://www.pushwoosh.com