CoAP client/server and start on bare metal

Client/src/main.rs

README.md

Server/Cargo.toml

Server/src/main.rs

nucleo/Cargo.toml

nucleo/app/.cargo/config

nucleo/app/.gdbinit

nucleo/app/.gitignore

nucleo/app/CHANGELOG.md

nucleo/app/Cargo.toml

nucleo/app/Cargo.toml.orig

nucleo/app/LICENSE-APACHE

nucleo/app/LICENSE-MIT

nucleo/app/README.md

nucleo/app/Xargo.toml

nucleo/app/build.rs

nucleo/app/examples/allocator.rs

nucleo/app/examples/crash.rs

nucleo/app/examples/device.rs

nucleo/app/examples/hello.rs