pipwin: add page (#7593)

pages/windows/pipwin.md

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+# pipwin
+
+> A tool to install unofficial Python package binaries on Windows.
+> More information: <https://github.com/lepisma/pipwin>.
+
+- List all available packages for download:
+
+`pipwin list`
+
+- Search packages:
+
+`pipwin search {{partial_name|name}}`
+
+- Install a package:
+
+`pipwin install {{package_name}}`
+
+- Uninstall a package:
+
+`pipwin uninstall {{package_name}}`
+
+- Download a package to a specific directory:
+
+`pipwin download --dest {{path/to/directory}} {{package_name}}`
+
+- Install packages according to `requirements.txt`:
+
+`pipwin install --file {{path/to/requirements.txt}}`