Update README.md

Update Sample code
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@ -30,7 +30,7 @@ ThorVG renders vector shapes on a given canvas buffer.
You can initialize ThorVG engine first: You can initialize ThorVG engine first:
```cpp ```cpp
tvg::Initializer::init(tvg::CanvasEngine::Sw); tvg::Initializer::init(tvg::CanvasEngine::Sw, 0); //engine method, thread count
``` ```
You can prepare a empty canvas for drawing on it. You can prepare a empty canvas for drawing on it.
```cpp ```cpp
@ -54,7 +54,12 @@ Begin rendering & finish it at a particular time.
canvas->draw(); canvas->draw();
canvas->sync(); canvas->sync();
``` ```
Lastly, you can acquire the rendered image in buffer memory. Now you can acquire the rendered image in buffer memory.
Lastly, terminate the engine after usage.
```cpp
tvg::Initializer::term(tvg::CanvasEngine::Sw);
```
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