docs: create PR template

[HugoReeves]

Created a pr template in an effort to resolve #187
This should ensure changes to the /data folder are made instead of changes to the README.md directly.
The PR template is below.

---

Does this pull request include an item addition/removal/edit? yes/no

If you answered yes to the previous question, ensure that your answers to the following questions are all yes; otherwise, delete this template and draft your own PR.

Did you edit the /data directory instead of the README.md? yes/no

Does this PR include only one addition/removal/edit? yes/no

Did you run the make build command following your edits to the /data directory? yes/no

Have you followed the CONTRIBUTING.md guidelines? yes/no

Details

Provide details of your changes here.

[hacdias]

@HugoReeves thanks for this contribution! I'd just change the questions to checkboxes though. Like this:

• I did edit edit the /data directory instead of the README.md.
• This PR includes only one addition/removal/edit.
• I run make build command following my edits to the /data directory.
• I followed the CONTRIBUTING.md guidelines.

[HugoReeves]

@hacdias The template now uses checkboxes.

[hacdias]

LGTM! Let's wait for more reviews 😄

[koalalorenzo]

Why don't we make comments liens for the first section?

<!--  
My lines of the PR
--!>

In this way we force them to read but it will not appear on every PR.
It might be a small suggestion, but it is ok to leave those visible! What do you think?

[HugoReeves]

@koalalorenzo I am happy to include the markdown comment. IMO it is better if we have a checkbox that must be ticked by the pr author. This means that when reviewing pr's we can observe that the author has actively agreed that they followed the CONTRIBUTING.md document.

Once this is resolved, is there any further work that needs to be done to have this pr merged?

[koalalorenzo]

Thank you! This will help a lot!!