new Python question not in list (linear runtime)

[Wingman4l7]

[Dhanush-Garrepalli]

The amount of time it takes the function to complete grows linearly as the input size increases

[Wingman4l7]

Here is the text of the question and answers in Markdown so a PR can be made and the question can be added:

Q53. What does it mean for a function to have linear runtime?

• You did not use very many advanced computer programming concepts in your code.
• The difficulty level your code is written at is not that high.
• It will take your program less than half a second to run.
• The amount of time it takes the function to complete grows linearly as the input size increases.

[Ebazhanov]

Thank you Guys! @Wingman4l7 @Dhanush-Garrepalli
FYI I added it directly to master, but it was a good idea to create PR