choco-pin: add page (#2037)

* choco-pin: add page

* choco-pin: update list example description

pages/windows/choco-pin.md

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+# choco pin
+
+> Pin a package at a specific version with Chocolatey.
+> Pinned packages are skipped automatically when upgrading.
+
+- Display a list of pinned packages and their versions:
+
+`choco pin list`
+
+- Pin a package at its current version:
+
+`choco pin add --name {{package}}`
+
+- Pin a package at a specific version:
+
+`choco pin add --name {{package}} --version {{version}}`
+
+- Remove a pin for a specific package:
+
+`choco pin remove --name {{package}}`