Add FanControl.ChromeboxEC plugin, project background, ectool docs

- Add FanControl.ChromeboxEC plugin for Fan Control
- Add project background/缘由 in README (EN/zh)
- Add docs/ectool-commands-zh.md
- Update sln, appsettings, gitignore

Made-with: Cursor

ChromeboxFanControl/appsettings.json

@@ -6,6 +6,8 @@
   "FanDutyArgs": null,
   "AutoFanCtrlArgs": [ "autofanctrl" ],
   "TempSource": "AverageCore",
+  "RampUpSteps": 3,
+  "RampUpMinDeltaPercent": 20,
   "FailSafeAfterConsecutiveErrors": 5,
   "FailSafeFanPercent": 100,
   "FailSafeRestoreAutoFan": false,