Add Flame

[ecklf]

Old PR was closed due to master -> main branch rename.

Reference for existing discussion: #1785

[sindresorhus]

A curated list of Games, Libraries, and Articles related to the Flame Engine for Flutter

Many words here that should not be capitalized.

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The license file is not valid. It needs to contain the whole license.

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Do not add the license name or text to the readme. GitHub already shows the license name at the top of the repo.

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Linkify Flame in Flame is a minimalist 2D game engine for Flutter that provides to its website.

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Non-english content should be in a separate Markdown file.

[ecklf]

@sindresorhus I have applied all of your suggested changes in flame-engine/awesome-flame#36.

Renaming master to main will be done ASAP. I don't have the repo rights to do that right now. <- Done
Chinese translations are removed and will be added in a separate file later. Just waiting for a native speaker to look over my changes.

[sindresorhus]

Tweet: https://twitter.com/awesome__re/status/1276832322390614016