Generate dev-requirements.txt + improve readme for contributors wanting to run tests

[TechnicalPirate]

Problem - Currently the cx_freeze project doesn't have a requirements file nor any dependency management solution - As usage of the product requires the importlib_metadata dependency and additional dependencies are required to contribute as a developer ( nose / pygments ) this can be a barrier to contributors.

Solution - This PR contributes a basic pipenv guide here setup This PR includes a dev-requirements.txt listing the dependencies required for developers - it also contributes a Readme.md for the /test/ directory explaining how contributors can execute the tests locally

TLDR:
* Adds pipfile and pipfile.lock for contributors who use pipenv

• Adds dev-requirements.txt to the project root
• Adds readme.md to the tests directory
• Adds an exclude of Pycharms .idea folder to the .gitignore

Note : Discussion here

[marcelotduarte]

@TechnicalPirate About this PR I've been thinking that the best would be if you create a dev-requirements.txt or test-requirements.txt file as I see in other projects (for example in pyzmq), so don't force the developer to use pipenv, and he/she can use whatever he/she wants.

[TechnicalPirate]

@marcelotduarte - as you wish, give me 5min to feed the cat and i'll spit out a dev-requirements.txt and update this PR :)

Does that mean you'd want the pipenv gubbins removing though? As by leaving it we'd support pipenv users as well out the box :)

[marcelotduarte]

How will I explain to you. I don't pipenv normally, and don't plan to use it. But I use it in a CI test just to see if cx_Freeze runs some samples. Then I will run the tests you are implementing. With the requirements we can create a Pipfile....

[marcelotduarte]

gubbins

I don't know this word nor google translator knows ;-)

[TechnicalPirate]

@marcelotduarte - Check now

I have:

• generated a dev-requirements.txt from my local venv
• Added pipenv specific files to .gitignore
• slightly updated the README.md in the test folder

Hope that helps!

As for gubbins - apologies for slang usage - i was referring to the files used by pipenv ... which have been removed ;) :D

[marcelotduarte]

Good! Thanks!