Added skill busybox-on-windows

skills/busybox-on-windows/SKILL.md

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+---
+name: busybox-on-windows
+description: How to use a Win32 build of BusyBox to run many of the standard UNIX command line tools on Windows.
+license: MIT
+---
+
+BusyBox is a single binary that implements many common Unix tools.
+
+Use this skill only on Windows. If you are on UNIX, then stop here.
+
+Run the following steps only if you cannot find a `busybox.exe` file in the same directory as this document is. 
+These are PowerShell commands, if you have a classic `cmd.exe` terminal, then you must use `powershell -Command "..."` to run them.
+1. Print the type of CPU: `Get-CimInstance -ClassName Win32_Processor | Select-Object Name, NumberOfCores, MaxClockSpeed`
+2. Print the OS versions: `Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion" | Select-Object ProductName, DisplayVersion, CurrentBuild`
+3. Download a suitable build of BusyBox by running one of these PowerShell commands:
+   - 32-bit x86 (ANSI): `$ProgressPreference = 'SilentlyContinue'; Invoke-WebRequest -Uri https://frippery.org/files/busybox/busybox.exe -OutFile busybox.exe`
+   - 64-bit x86 (ANSI): `$ProgressPreference = 'SilentlyContinue'; Invoke-WebRequest -Uri https://frippery.org/files/busybox/busybox64.exe -OutFile busybox.exe`
+   - 64-bit x86 (Unicode): `$ProgressPreference = 'SilentlyContinue'; Invoke-WebRequest -Uri https://frippery.org/files/busybox/busybox64u.exe -OutFile busybox.exe`
+   - 64-bit ARM (Unicode): `$ProgressPreference = 'SilentlyContinue'; Invoke-WebRequest -Uri https://frippery.org/files/busybox/busybox64a.exe -OutFile busybox.exe`
+
+Useful commands:
+- Help: `busybox.exe --list`
+- Available UNIX commands: `busybox.exe --list`
+
+Usage: Prefix the UNIX command with `busybox.exe`, for example: `busybox.exe ls -1`
+
+If you need to run a UNIX command under another CWD, then use the absolute path to `busybox.exe`.
+
+Documentation: https://frippery.org/busybox/
+Original BusyBox: https://busybox.net/