Created SC2048 (markdown)

SC2048.md

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+## Use "$@" (with quotes) to prevent whitespace problems.
+
+### Problematic code:
+
+    cp $* ~/dir
+
+### Correct code:
+
+    cp "$@" ~/dir
+
+### Rationale:
+
+`$*`, unquoted, is subject to word splitting and globbing.
+
+Let's say you have three arguments: `baz`, `foo bar` and `*`
+
+`"$@"` will expand into exactly that: `baz`, `foo bar` and `*`
+
+`$*` will expand into multiple other arguments: `baz`, `foo`, `bar`, `file.txt` and `otherfile.jpg`
+
+Since the latter is rarely expected or desired, ShellCheck warns about it.
+
+### Contraindications
+
+None.