hello_exercism 0.5.4

how to create an own crate
Documentation
# Crate Configuration File: ./Cargo.toml
[package]
name = "hello_exercism"
version = "0.5.4"
authors = ["cnruby <gudao.luo@gmail.com>"]
edition = "2018"
readme = "README.md"
license = "MIT OR Apache-2.0"
repository = "https://github.com/cnruby/learn-rust-by-crates/tree/master/hello-world"
homepage = "https://crates.io/crates/hello_exercism"
documentation = "https://cnruby.github.io/learn-rust-by-crates/hello-world/hello_exercism/"
categories = ["development-tools::learn-languange-and-tools"]
description = "how to create an own crate"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
#hello_extern = { version = "0.1.1"}
i_crate = { version = "0.1.1", package = "hello_extern"}