Created SC2054 (markdown)

SC2054.md

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+## Use spaces, not commas, to separate array elements.
+
+### Problematic code:
+
+```sh
+flags=("-l", "-d", "--sort=size")
+ls "${flags[@]}"
+```
+
+### Correct code:
+
+```sh
+flags=("-l" "-d" "--sort=size")
+ls "${flags[@]}"
+```
+### Rationale:
+
+You appear to have used commas to separate array elements in an array assignment. Other languages require this, but bash instead treats the commas as literal strings.
+
+In the problematic code, the first element is `-l,` with the trailing comma, and the executed command ends up being `ls -l, -d, --sort=size`.
+
+In the correct code, there are no trailing commas and the command will be `ls -l -d --sort=size` as expected.
+
+### Exceptions:
+
+None (if you actually want a trailing comma in your strings, move it inside the quotes).