Add 'CARDPUTER Arduino/README.md'

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# Setup
1. Add to board manager URLs in preferences:
```
https://static-cdn.m5stack.com/resource/arduino/package_m5stack_index.json
```
2. Search for `m5stack` in board manager and install
# Libraries
- Search for and install M5Cardputer
# Issues
"No module named 'serial'"
`pip install serial` in terminal
# Examples
## qrcodei2c
Displays data from scanned QR codes and some 1D (bar) codes