Note tag label names and definitions

The word "Issues" encompassed both bugs and feature requests.

If the meaning is blank, then the meaning is implicit in the name (contribute a clarifying definition if you believe the meaning is not self-evident).

If the meaning is a "?", then Felix did not immediately know the meaning of the label and does not think it is self-evident.

Label	Meaning
A-an-interesting-project	A self-contained independent project
A-android	Related to Android mobile device OS
A-attributes	Issues with Rust meta-data attributes
A-build	Issues bootstrapping rust compiler and runtime
A-codegen	Issues with rustc code generator
A-concurrency
A-debuginfo
A-destructors
A-diagnostics	?
A-docs	Issues with tutorials, manuals, and API docs
A-driver	Issues with wrapper around rustc/rustdoc/etc
A-freebsd	Related to FreeBSD operating system
A-frontend	?
A-grammar	Issues with the formal grammar of Rust
A-iOS	Related to Apple iOS device operating system
A-infrastructure	Mozilla-hosted services: buildbot, website, etc
A-instrumentation	Rust library / object code instrumentation
A-libs	Rust standard and contributed libraries
A-linkage	Crate format+tooling for dynamic/static linking
A-lint	Warning categorization and tooling in rustc
A-linux	Related to Linux operating system
A-llvm	Related to LLVM IR and code-generation library
A-macos	Related to Apple Mac OS X operating system
A-metadata	Crate-embedded data for reflection/compilation
A-parser	put label description here
A-pkg	put label description here
A-pretty	put label description here
A-regions	put label description here
A-resolve	put label description here
A-runtime	put label description here
A-rustdoc	put label description here
A-rusti	put label description here
A-syntaxext	put label description here
A-testsuite	put label description here
A-tools	put label description here
A-traits	put label description here
A-typesystem	put label description here
A-versioning	put label description here
A-windows	put label description here
B-RFC	put label description here
B-clarifying	put label description here
B-reproduce	put label description here
E-easy	put label description here
E-hard	put label description here
I-ICE	put label description here
I-cleanup	put label description here
I-completion	put label description here
I-crash	put label description here
I-enhancement	put label description here
I-nominated	put label description here
I-papercut	put label description here
I-slow	put label description here
I-wishlist	put label description here
I-wrong	put label description here
metabug	put label description here