xcodes, xcodes-runtimes: add page (#10718)

* xcodes, xcodes-runtimes: add page

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/osx/xcodes-runtimes.md

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+# xcodes runtimes
+
+> Manage Xcode Simulator runtimes.
+> More information: <https://github.com/xcodesorg/xcodes>.
+
+- Display all available Simulator runtimes:
+
+`xcodes runtimes --include-betas`
+
+- Download a Simulator runtime:
+
+`xcodes runtimes download {{runtime-name}}`
+
+- Download and install a Simulator runtime:
+
+`xcodes runtimes install {{runtime-name}}`

pages/osx/xcodes.md

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+# xcodes
+
+> Download, install and manage multiple Xcode versions.
+> See also: `xcodes runtimes`.
+> More information: <https://github.com/xcodesorg/xcodes>.
+
+- List all installed Xcode versions:
+
+`xcodes installed`
+
+- List all available Xcode versions:
+
+`xcodes list`
+
+- Select an Xcode version by specifying a version number or a path:
+
+`xcodes select {{xcode-version|path/to/Xcode.app}}`
+
+- Download and install a specific Xcode version:
+
+`xcodes install {{xcode-version}}`
+
+- Install the latest Xcode release and select it:
+
+`xcodes install --latest --select`
+
+- Download a specific Xcode version archive to a given directory without installing it:
+
+`xcodes download {{xcode-version}} --directory {{path/to/directory}}`