trash-cli: add page (#2105)

pages/common/trash-cli.md

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+# trash-cli
+
+> A command line interface to the trashcan APIs.
+
+- Trash files and directories:
+
+`trash-put {{file_name}}`
+
+- Empty the trashcan:
+
+`trash-empty`
+
+- List trashed files:
+
+`trash-list`
+
+- Restore a trashed file by choosing a number from the list that results from this command:
+
+`trash-restore`
+
+- Remove individual files from the trashcan:
+
+`trash-rm {{file_name}}`