Add T.A.M.I Drawbot modifications changelog to README

- Added changelog section documenting all modifications since forking
- Documented December 4, 2025 changes (inverted servo PWM, M5 fix)
- Listed earlier modifications (servo mode, homing fix)

README.md

@@ -1,8 +1,29 @@
 ![GitHub Logo](https://github.com/gnea/gnea-Media/blob/master/Grbl%20Logo/Grbl%20Logo%20250px.png?raw=true)
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-### Grbl v1.1 has been released [here](https://github.com/gnea/grbl/releases)!
-### Notice: This site will be phased out and moved to the new one!
+this is (yet another) grbl mod/fork to fit [T.A.M.I](https://tami.sh)'s [drawbot](https://git.telavivmakers.space/yair/drawbot_LY)
+
+## T.A.M.I Drawbot Modifications Changelog
+
+### December 4, 2025
+- **Inverted Servo PWM Mapping**: Changed servo control to match intuitive pen operation
+  - S0 = Pen UP (16 ticks / ~1ms pulse)
+  - S1000 = Pen DOWN (31 ticks / ~2ms pulse)
+  - Previous behavior was reversed
+- **M5 PWM Disable**: M5 now properly disables PWM output in both standard and servo modes
+  - Servo unpowered when M5 command is issued
+  - Use M3 S0 to keep servo powered at pen-up position
+
+### Earlier Modifications
+- **Servo Mode Implementation**: Added servo control capability for pen plotters
+  - See [SERVO_MODE.md](SERVO_MODE.md) for full documentation
+  - Supports hobby servos via PWM output (Pin D11)
+  - ~61Hz PWM frequency suitable for servo control
+  - 16 discrete positions (16-31 ticks range)
+  - Configurable via `USE_SPINDLE_SERVO_MODE` in config.h
+
+- **Homing Fix**: Modifications to homing behavior for drawbot application
+  - See [HOMING_FIX.md](HOMING_FIX.md) for details
 
 ***