Update README.md

Author: skycommand

README.md

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 # Administrative scripts
 Scripts for carrying out administrative tasks, mostly in Windows
+
+## Download
+
+1. `Download-Channl9VideosFromRSS.ps1` helps download entire Channel 9 sets of videos. It accepts one RSS URL for the video set and one download location.
+
+## Firewall
+
+1. `Report status.cmd` reports whether Windows Firewall is on or off. It requires Windows 10.
+
+## Shell
+
+1. `PowerShell bug fix for 'Run with PowerShell' verb.reg` correctly registers Windows PowerShell with File Explorer. It is especially useful for those who have installed Visual Studio Code or have corrupted their .ps1 registration.
+
+## Shutdown
+
+The names of these scripts are self-explanatory.
+
+1. Log off.vbs
+2. Power off (Alternative).vbs
+3. Power off.vbs
+4. Restart (Alternative).vbs
+5. Restart.vbs
+
+## Unicode test suite
+
+See [its documentation](./Unicode test suite/README.md)
+
+## Wallpaper
+
+The following two scripts are co-developed with Ramesh Srinivasan (the author of [WinHelpOnline.com](https://www.winhelponline.com)). More specifically, he wrote them in VBScript first, and I re-wrote them in PowerShell to support Unicode. Then, he credited me in his blog post and we added additional bits to support Windows 10. Back then, I knew zero about PowerShell and its philosophy, so, these scripts are unlike any other PowerShell scripts. In fact, they generate graphical message boxes.
+
+1. Find current wallpaper (Windows 7).ps1
+2. Find current wallpaper (Windows 8,10).ps1