Initial Setup for the microbit v1

SETUP.md

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+# Install tools
+
+```shell
+cargo install cargo-binutils
+cargo install probe-rs-tools
+rustup component add llvm-tools
+```
+
+## MacOS
+
+```shell
+brew install arm-none-eabi-gdb picocom lsusb
+```
+
+## Other OSes
+
+Please refer to the instructions from:
+
+* Linux : https://docs.rust-embedded.org/discovery/microbit/03-setup/linux.html
+* Windows : https://docs.rust-embedded.org/discovery/microbit/03-setup/windows.html
+
+# Verifying installation
+
+With the BBC micro:bit connected through USB:
+
+```shell
+probe-rs list
+probe-rs info
+```