Add readme for canvas

src/Components/Canvas/README.md

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+# Canvas API
+
+Canvas API is currently experimental and supports neither custom SVG nor SVG export yet.
+
+It is an alternative to the SVG and offers the following pros:
+- Hardware acceleration
+- Better compatibility with Gecko and WebKit web engine
+- More freedom with animations
+
+However, there are cons:
+- Animation must be hand made without CSS
+- `csstype` cannot be used and must be mapped to its object (i.e `strokeWidth` become `ctx.lineWidth`)
+- More complex to learn and to read
+
+As you can see, for the user experience Canvas API may be the best solution while SVG is better for fast development.
+
+Currently, SVG is preferred as it offers more features. However, it is known that Gecko engine is crashing on the SVG rendering when objects are moving.