Add CP requirements in a better place than readme.txt file

Note to myself
This needs to be so prominent so we can avoid this stuff:

Most likely due to a theme or plugin requirements of wp 5.0 above

Of 10 users with this issue likely only 2 actually take the time to report issues - from my experience during support times most users either act like “it works” or “it doesn’t work, is :poop:, i’m out”.

Only very few spend the time to report, and half of them report only as “piggy back” followers of an already reported issue.

Thus we have to assume that there are 9 users now already disregarding cp due to easily avoidable issues, and one willing to report the issue :smiling_face_with_tear:

I’ll try to tackle this tomorrow so download page is crystal clear and lets users begin without hassle.