message: Add an explanation of the labels
diff: @@ -31,6 +31,49 @@ open target/doc/index.html
  ```
  +## Issue Triage
  +
  +Sometimes, an issue will stay open, even though the bug has been fixed. And
  +sometimes, the original bug may go stale because something has changed in the
  +meantime.
  +
  +It can be helpful to go through older bug reports and make sure that they are
  +still valid. Load up an older issue, double check that it's still true, and
  +leave a comment letting us know if it is or is not. The [least recently
  +updated sort][lru] is good for finding issues like this.
  +
  +Contributors with sufficient permissions on the Rust repo can help by adding
  +labels to triage issues:
  +
  +* Yellow, **A**-prefixed labels state which **area** of the project an issue
  + relates to.
  +
  +* Magenta, **B**-prefixed labels identify bugs which are **blockers**.
  +
  +* Light purple, **C**-prefixed labels represent the **category** of an issue.
  +
  +* Dark purple, **Command**-prefixed labels mean the issue has to do with a
  + specific cargo command.
  +
  +* Green, **E**-prefixed labels explain the level of **experience** or
  + **effort** necessary to fix the issue.
  +
  +* Red, **I**-prefixed labels indicate the **importance** of the issue. The
  + [I-nominated][inom] label indicates that an issue has been nominated for
  + prioritizing at the next triage meeting.
  +
  +* Purple gray, **O**-prefixed labels are the **operating system** or platform
  + that this issue is specific to.
  +
  +* Orange, **P**-prefixed labels indicate a bug's **priority**. These labels
  + are only assigned during triage meetings, and replace the [I-nominated][inom]
  + label.
  +
  +If you're looking for somewhere to start, check out the [E-easy][eeasy] tag.
  +
  +[eeasy]: https://github.com/rust-lang/cargo/issues?q=is%3Aopen+is%3Aissue+label%3AE-easy
  +[lru]: https://github.com/rust-lang/cargo/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-asc
  +
  ## Getting help
  If you need some pointers about Cargo's internals, feel free to ask questions
  