Add Pi setup instructions.

durio/pi-setup-notes.md

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+1. Flush SD card with the newest Lite OS.
+2. Touch /boot/ssh on the pi.
+3. Connect pi to the Internet router via a network cable.
+4. Connect dev machine to same router.
+5. ssh pi@`the ip address` with password 'raspberry'. 
+   1. Change the password. 
+   2. Change hostname to pi-`nextname`.
+   3. Connect the pi to the Raft router via wireless.
+   4. Run `sudo apt-get update`.
+   5. Reboot.
+6. Run `ssh-keygen -t ed25519 -f .ssh/pi-nextname`
+7. Copy SSH key pub file to pi.
+   1. `mkdir -p .ssh`
+   2. `mv pi.pub .ssh/authorized_keys`