chore(docs): add minimum Arduino IDE requirement (#46)

Signed-off-by: dankeboy36 <dankeboy36@gmail.com>

Author: dankeboy36

README.md

@@ -6,6 +6,10 @@ ESP Exception Decoder is an Arduino IDE 2.x extension that helps you understand
 
 > ⚠️ This extension is not related to the [Visual Studio Code extension for Arduino](https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.vscode-arduino). Please note that this extension does not work in VS Code.
 
+## Requirements
+
+**Arduino IDE 2.2.0 or newer** is required. The extension relies on features introduced in [arduino/arduino-ide#2110](https://github.com/arduino/arduino-ide/issues/2110). Earlier versions (such as 2.1.1) are not supported and will result in errors like ["Sketch path is not set"](https://github.com/dankeboy36/esp-exception-decoder/issues/45).
+
 ## Installation
 
 1. Download the latest extension from the GitHub [release page](https://github.com/dankeboy36/esp-exception-decoder/releases/latest). The filename should be `esp-exception-decoder-${VERSION}.vsix`, where `${VERSION}` is the latest version.