Programmatically generate SVG (vector) images, animations, and interactive Jupyter widgets

Add import statement to readme examples

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README.md
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### Basic drawing elements
```python
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import drawSvg as draw
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d = draw.Drawing(200, 100, origin='center')
d.append(draw.Lines(-80, -45,
···
### Gradients
```python
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import drawSvg as draw
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d = draw.Drawing(1.5, 0.8, origin='center')
d.draw(draw.Rectangle(-0.75,-0.5,1.5,1, fill='#ddd'))
···
### Duplicate geometry and clip paths
```python
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import drawSvg as draw
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d = draw.Drawing(1.4, 1.4, origin='center')
# Define clip path
···
### Implementing other SVG tags
```python
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import drawSvg as draw
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# Subclass DrawingBasicElement if it cannot have child nodes
# Subclass DrawingParentElement otherwise
# Subclass DrawingDef if it must go between <def></def> tags in an SVG