Updated readme to include a screenshot of testchip

README.md

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 # armleo gpio mpw5 test chip
 Refer to [armleo_gpio](https://github.com/armleo/armleo_gpio)
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+This is a test chip tapeout. To estimate the delay + rise/fall times of armleo_gpio.
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+Testchip picture:
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+![Testchip](docs/design_screenshot.PNG)