[crate_universe] Add README to `examples/crate_universe` directory (#759) To explain that `RULES_RUST_CRATE_UNIVERSE_BOOTSTRAP` environment variable must be set to `true` for examples to "just work." Also removes reference to `bootstrap.sh` from the `crate_universe/CONTRIBUTING.md` file since `bootstrap.sh` no longer exists
This repository provides rules for building Rust projects with Bazel.
Please refer to the full documentation.