powershell: add page (#4634)

pages/windows/powershell.md

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+# powershell
+
+> Command-line shell and scripting language designed especially for system administration.
+> More information: <https://docs.microsoft.com/windows-server/administration/windows-commands/powershell>.
+
+- Start a Windows PowerShell session in a Command Prompt window:
+
+`powershell`
+
+- Load a specific PowerShell console file:
+
+`powershell -PSConsoleFile {{path/to/file}}`
+
+- Start a session with a specified version of PowerShell:
+
+`powershell -Version {{version}}`
+
+- Prevent the shell from exit after running startup commands:
+
+`powershell -NoExit`
+
+- Describe the format of data sent to PowerShell:
+
+`powershell -InputFormat {{Text|XML}}`
+
+- Determine how output from PowerShell is formatted:
+
+`powershell -OutputFormat {{Text|XML}}`
+
+- Display help:
+
+`powershell -Help`