add smith and membership commands

.vscode/settings.json

Cargo.lock

doc/example.md

res/metadata.scale

rust-toolchain.toml

src/commands.rs

src/commands/account.rs

src/commands/blockchain.rs

src/commands/certification.rs

src/commands/collective.rs

src/commands/identity.rs

src/commands/oneshot.rs

src/commands/smith.rs

src/commands/sudo.rs

src/commands/transfer.rs

src/commands/ud.rs

src/data.rs

src/main.rs

src/utils.rs