Update README.md

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@ -5,20 +5,36 @@ Unofficial Python library for working with the [AxiDraw v3](http://www.axidraw.c
### Features
- control AxiDraw v3 directly from Python with a simple API
- convenient command-line utility
- constant acceleration (trapezoidal velocity) motion planning
- path drawing order optimization
- drawing transformations
- translate, scale, rotate
- scale and/or rotate to fit page
- move to origin or center of page
- preview drawing (render to png)
- [turtle graphics](https://en.wikipedia.org/wiki/Turtle_graphics)
### Command Line Utility
Once `pip install'd`, you can run the axi command-line utility. Here are the supported commands:
```
axi on # enable the motors
axi off # disable the motors
axi up # move the pen up
axi down # move the pen down
axi zero # set current position as (0, 0)
axi home # return to the (0, 0) position
axi move DX DY # move (DX, DY) inches, relative
axi goto X Y # move to the (X, Y) absolute position
```
### TODO / Coming Soon
- primitives
- circles, arcs, beziers
- svg support
- preview (render to png)
- progress / status while drawing
### Installation