Managing our code with crates and Cargo instead of pip

Building our own application is going to involve the following steps:

1. Create a simple Rust file and run it.
2. Create a simple application using Cargo.
3. Run our application using Cargo.
4. Manage dependencies with Cargo.
5. Use a third-party crate to serialize JSON.
6. Document our application with Cargo.

Before we start structuring our program with Cargo, we should compile a basic Rust script and run it:

1. To do this, make a file called hello_world.rs with the main function housing the println! function with a string, as we can see here:

   fn main() {
       println!("hello world");
   }

2. Once this is done, we can navigate to the file and run the rustc command:

   rustc hello_world.rs 

3. This command compiles the file into a binary to be run. If we compile on Windows, we can run the binary with the following command:

   .\hello_world.exe

4. If we compile it on Linux or Mac, we can...