MiniJinja Basic Example

This is a basic MiniJinja example. It's pulled directly from the docs with one change. It uses `.add_template_owned()instead of `.add_template() so that strings (i.e. `String) can be used instead of `&str.

```cargo
[dependencies]
minijinja = { version = "2.6.0", features = ["loader"] }
```

use minijinja::{Environment, context};

fn main() {
    let mut env = Environment::new();
    env.add_template_owned(
        "hello", "Hello, {{ name }}!".to_string()
    ).unwrap();
    match env.get_template("hello") {
        Ok(template) => {
            match template.render(context!(name => "World")) {
                Ok(output) => {
                    println!("{}", output);
                }
                Err(e) => { dbg!(e); ()}
            }
        }
        Err(e) => { dbg!(e); ()}
    }
}

Output:

Hello, World!

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