Add repository main logo

Author: xavierfoucrier

README.md

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 # mojs curve editor
 
-<img width="444" src="https://github.com/legomushroom/mojs-curve-editor/blob/master/mockups/curve-editor.png?raw=true" alt="mojs-curve-editor" />
+![mojs-curve-editor](logo.png "mojs-curve-editor")
 
 `MojsCurveEditor` is a GUI plugin for interactive `custom easings`/`property curves` editing while crafting your animations. Part of `mojs` tools.