Import regression test files from other projects

[reyammer]

No description provided.

[SarthakNikhal]

@reyammer Can I help with this issue

[reyammer]

Hey, sure thing! I would start with a couple of small sources so that I can provide feedback on how to organize the tests, sounds good?

Notes on the current plan:

• store them under: tests_data/<name of the external project>/....
• I would start with small textual examples; these extra tests are meant to be helpful to track how we are handling nasty cases, rather than checking that we get everyone right (we are training v2 as we speak, so things should get better soon)
• I would start collecting the few examples from guesslang's README: https://github.com/yoeo/guesslang/tree/master. Let's store them under tests_data/guesslang_examples/*
• Another good source to collect is corner cases discussed here: Links/Samples where language auto-detection doesn't work microsoft/vscode#131450 Let's store them under tests_data/vscode_examples/*

I would start with these above, let me know if you have any questions, thanks!