Xcode plugins post

+1 to this intro. I'll propose some edits - let me know what you think:

`Xcode is a comprehensive SDK that provides everything you need to create beautiful, interactive applications. However, due to it's closed-source codebase and no official support for extension hooks it falls short in the realm of social and community supported code. It lacks the flexibility that allows the community to grow and feel at home by adapting and maintaining their own code and tools.`