Add TLDR short doc

TLDR.md

@@ -0,0 +1,37 @@
+# ADV360-PRO-ZMK
+
+```
+Reminder of center key layout:
+X    Mod
+1    3
+2    4
+```
+
+e.g. Bootloader left = Mod + Hotkey 1 = Hold press Mod + mid left center key
+e.g. Bootlader right = Mod + Hotkey 3
+
+## How to update after config changes 
+
+1. Commit and push changes
+2. Connect cable to left module
+3. Press Mod + Hotkey 1 to attach left module in bootloader mode
+4. Wait for [GitHub Actions to build artifacts](https://github.com/sudotliu/Adv360-Pro-ZMK/actions)
+5. Drag 'left' artifact file onto left module
+6. Wait until loaded and self-ejected (ignore OS warning "can't be read")
+7. Repeat from step 2 for right module (bootloader = Mod + Hotkey 3)
+
+### Cleanup
+
+The built docker container and compiled firmware files can be deleted with `make clean`.
+
+## Flashing firmware
+
+- [Quick Guide](https://kinesis-ergo.com/wp-content/uploads/Step-by-Step-Advantage360-Professional-Firmware-Installation-Instructions-KB360-PRO_v9-16-22.pdf)
+- [Full Manual](https://kinesis-ergo.com/wp-content/uploads/Advantage360-ZMK-KB360-PRO-Users-Manual-v12-1-22.pdf)
+
+## Other support
+
+Further support resources can be found on Kinesis.com
+- https://kinesis-ergo.com/support/kb360pro/#firmware-updates
+- https://kinesis-ergo.com/support/kb360pro/#manuals
+