Added an example of how to use Markdown checkbox

[opusforlife2]

What is it?

• Bug fix (user facing)
• Feature (user facing)
• Code base improvement (dev facing)
• Meta improvement to the project (dev facing)

Fixes the following issue(s)

• Some users don't know how to properly tick the check boxes. So I've modified the issue templates to give an example each.

Agreement

• I carefully read the contribution guidelines and agree to them.

[wb9688]

I don't know if pre-checking one of the boxes is the best idea, as people might then skip that item

[opusforlife2]

This is the least problematic of the items. People generally do ensure they are on the latest version because it is easy to check. But checking the repo for duplicates or reading the contribution document takes time.

[Stypox]

Can this be merged? I agree with you @opusforlife2 , that having a checked checkbox does not hurt in terms of the user checking, but is a good example

[opusforlife2]

I would love to have an automatically replaced Version in the template like youtube-dl, but that involves coding and is beyond my abilities.

[Stypox]

@opusforlife2 that can be done in the future, ok