I am afraid I didn't get what exactly what you need.
If you want to learn how to create such project, then I recommend you to read this tutorial
Working With Custom Content Types in Alfresco | ECMArchitect | Alfresco Developer Tutorials
Now, if you just want to have a sample project to check the source code, then you can use the project used in the previous tutorial, available on github, at alfresco-developer-series/content at master · jpotts/alfresco-developer-series · GitHub
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