add README for pwsh PROFILE

dotfiles/pwsh/README.md

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+# PowerShell PROFILE description
+some notable features
+
+## Key-Bindings
+- tab completion like fish
+- `Ctrl + D` to exit
+- `Ctrl + G` to Invoke-FzfTabCompletion
+- `Ctrl + t` to select providers with fzf
+- `Ctrl + r` to fzf history
+
+## Aliases
+- `~`, `..`
+- `epl` = `explorer.exe .`
+- `whereis` = `where.exe`
+
+## Change Encodings Instantly
+You can change PowerShell encodings instantly.
+Especially useful for piping into linux commands like `less`
+- `Set-UTF8`, `Set-UTF16LE`
+- `Remove-EncodingSettings`
+- `Reset-EncodingSettings`
+
+## ssh-agent
+- `Invoke-SshAdd`
+
+## `$env:`
+- `$env:LESS`
+
+## Auto Completions
+- scoop
+- chezmoi
+- git
+- winget
+- chocolatey