Start Canvas module doc

docs/modules/Canvas.md

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+---
+title: Canvas
+---
+
+# Canvas
+
+> [!WARNING]
+> The documentation of this module is still a work in progress.
+
+::: warning
+This guide is referring to GrapesJS v0.21.5 or higher
+:::
+
+
+## Configuration
+
+To change the default configurations you have to pass the `canvas` property with the main configuration object.
+
+```js
+const editor = grapesjs.init({
+  ...
+  canvas: {
+    ...
+  }
+});
+```
+
+Check the full list of available options here: [Canvas Config](https://github.com/GrapesJS/grapesjs/blob/master/src/canvas/config/config.ts)
+
+
+## Canvas Spots