Document differences across dotenv implementations

[allan2]

Ruby, JS, and Rust all have differences in their implementations.

This should be documented.

Relevant #11

[aidenfarley]

@allan2 would your comment on #11 be detailed enough to consider as a "preliminary" document for the differences across implementations?

If not, what are you looking for when it comes to this?

I would be more than happy to write this up, and any resources you may have pointing to the current behavior of other applications would be much appreciated.

[allan2]

I am looking to clearly define the scope and behaviour of this crate. It would be helpful if I had more information on how these features are implemented in other Rust crates (dotenv crate) and other languages:

• escaping
• quotes (single, double, nested)
• spaces
• multiline
• variable substitution
• export

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