Raise exception if `.env.sample` file is not found?

[etagwerker]

Before we start...:

• [x] I checked the documentation and didn't find this feature
• [x] I checked to make sure that this feature has not already been requested

Branch/Commit:

main branch.

Describe the feature:

Maybe we should raise an exception if the user is trying to use the library without a .env.sample file?

Problem:

This library doesn't do anything if you don't have a .env.sample file in the root directory of your application, which could lead to bug reports because .env.sample is not found.

Resources:

Trying to follow the "principle of least astonishment" here: https://en.wikipedia.org/wiki/Principle_of_least_astonishment

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