This was extracted from https://github.com/hoijui/dotenv.
The easiest and most common usage consists on calling dotenv::load when the
application starts, which will load environment variables from a file named
.env in the current directory or any of its parents.
If you need more control about the file name or its location, you can
use the load_filename and load_path.
A .env file looks like this:
```dotenv
REDISADDRESS=localhost:6379 MEANINGOF_LIFE=42 ```
You can optionally prefix each line with the word export, which will
conveniently allow you to source the whole file on your shell.
A sample project using dotenv would look like this:
rust
fn main() {
for (key, value) in dotenv::vars() {
println!("{}: {}", key, value);
}
}