Npx: Create npx_add_npx_to_command.py

[KartikSoneji]

Add npx to command

Prefixes npx to command name to run locally installed npm commands, also corrects misspelled npx commands.

Example
jest	npx jest
npx jeet	npx jest
jeet	npx jest

[KartikSoneji]

I am not sure how to write tests for the code, any help would be appreciated.

[scorphus]

Thanks for contributing, @KartikSoneji! Apologies for the delay.

This is looking good. Regarding tests, you can base off of any existing test and write unit tests for match and get_new_command. Take the following as an example:

https://github.com/nvbn/thefuck/blob/11b70526f72339bcce0beefa1665c74bb06e18b3/tests/rules/test_git_commit_add.py#L1-L38