add neotest plugin example

[JBSK8NC]

resolves #39

Example config for the Neotest plugin.
Neotest adapters for python and jest.
Vim-Test setup example.

[JBSK8NC]

Yo @ChristianChiarulli ,

I've got an example with python and JS/TS.
Is there any more languages that you would like me to add for examples?
Let me know,

Thanks-

[meicale]

@ChristianChiarulli I think it is quick useful.