Resolves #20: Generate random color for username and avatar background

[nicoschmdt]

Creates a list with six different colors and randomly chooses one for the username and one for the profile picture background

[tarcisioe]

LGTM, but a strong suggestion would be to somehow derive the color from the user ID or the person's name, so you get more consistent results than just a random choice.

User ID is already an integer, it could be used to get a color with id % len(FOREGROUND_COLORS) as an example.

[diogojs]

@nicoschmdt I agree with @tarcisioe's suggestion. It would also be better so the avatar and username would have the same color (the way you implemented we can get a blue avatar with a red username).

[nicoschmdt]

I committed the suggested changes, can you check if it needs some improvements?

[tarcisioe]

I'd just refactor it to a function such as

def get_user_color(user_id: int) -> str:
    return FOREGROUND_COLORS[user_id % len(FOREGROUND_COLORS)]

to avoid error-prone duplication. Also, was this tested?

[tarcisioe]

LGTM. @diogojs just give it a last review before we merge it.