Give guidelines on how to write and publish a crate

[deadghost]

Some more guidelines on crates would be appreciated as to me it seems like the fundamental unit of pallet. Some things to include:

• Where to find crates (such that people don't unintentionally reinvent wheels)
• How to write a crate
• Which phases should do what
• Where to publish crates

[deadghost]

For example rstradling's nginx-crate uses the :run phase to start nginx. The CLI command is service nginx start. Should the phase that starts the service always be named :run?