gh-codespace: add page (#7239)

pages/common/gh-codespace.md

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+# gh codespace
+
+> Connect and manage your codespaces in GitHub.
+> More information: <https://cli.github.com/manual/gh_codespace>.
+
+- Create a codespace in GitHub interactively:
+
+`gh codespace create`
+
+- List all available codespaces:
+
+`gh codespace list`
+
+- Connect to a codespace via SSH interactively:
+
+`gh codespace ssh`
+
+- Transfer a file to a codespace interactively:
+
+`gh codespace cp {{path/to/source_file}} remote:{{path/to/remote_file}}`
+
+- List the ports of a codespace interactively:
+
+`gh codespace ports`
+
+- Print the logs from a codespace interactively:
+
+`gh codespace logs`
+
+- Delete a codespace interactively:
+
+`gh codespace delete`
+
+- Display help for a subcommand:
+
+`gh codespace {{subcommand}} --help`

pages/common/gh-cs.md

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+# gh cs
+
+> This command is an alias of `gh codespace`.
+> More information: <https://cli.github.com/manual/gh_codespace>.
+
+- View documentation for the original command:
+
+`tldr gh-codespace`