Add readme

Firmware/README.md

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+# Notes
+
+## Roadplan
+
+ - Simple (but future expandable) bootloader
+   - Loading over serial usb would be nice!
+   - Needs to communicate and check with the modem and load a program from it.
+ - Basic OS code
+
+
+# Resources
+
+Super helpful explanation of how the bootloader/memory system on the pico works
+https://blog.usedbytes.com/2021/12/pico-serial-bootloader/