This macro was very useful to me when using actix, instead of making a bunch of structs
for each possible json, you can use this macro and simply define the struct with a macro
above the functions.
To use this macro you can do the following:
``` rust
use in_struct::define_struct;

#[define_struct(name = Name, derives = [Debug], fields = {field_1: i32, field_2: String})]
fn func(x: Name) {
     println!("{:?}", x);
}
```