add readme

readme.md

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+Taskbar Proxy Control
+===
+
+usage
+---
+
+Build with pyinstaller. Windows only, Python 3.11 (3.12 is not supported by pyqtdarktheme)
+
+```powershell
+python -m venv venv
+. .\venv\Scripts\Activate.ps1
+pip install -r requirements.txt
+pyinstaller ProxyControl.spec
+```
+
+Run the executable in the dist folder
+
+If could not start, check `failures.log` in the same folder
+