Created copy (markdown)

copy.md

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+The `copy` function has 3 parameters.
+
+- `source` -> The file to copy
+- `destination` -> Where to copy to
+- `message` -> The message to show while copying
+
+Example:
+```json
+{
+    "type": "copy",
+    "source": "sdmc:/example.3dsx",
+    "destination": "sdmc:/3ds/example.3dsx",
+    "message": "Copying example.3dsx to sdmc:/3ds"
+}
+```