Eg: Default for dummy data.

Why Eg?

Use Eg to provide example values:

```rust use eg::Eg;

[derive(Debug, PartialEq, Eg)]

struct Wizard { #[eg = "Harry Potter"] name: String, #[eg = "11"] age: usize, #[eg = "totallyrandomspell"] fav_spell: Spell, }

[derive(Debug, PartialEq)]

enum Spell { Expelliarmus, WinguardiumLeviosa, }

fn totallyrandomspell() -> Spell { Spell::Expelliarmus }

asserteq!( Wizard { name: "Harry Potter".tostring(), age: 11, fav_spell: Spell::Expelliarmus }, Wizard::eg() ); ```

When Default doesn't make sense, isn't available, or isn't expressive enough:

```rust

[test]

fn mydatabasetest() { // database stuff ... db.insert(Wizard::eg()); // more database stuff ... } ```

Why not a global const?

In const-compatible contexts, this is probably an acceptable approach! For everything else, there's Eg 😉

Contribution

This crate is still learning to walk; feedback, issues and PRs are all welcome! (◕‿◕)