Created SC2301 (markdown)

SC2301.md

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+## Parameter expansion starts with unexpected quotes. Double check syntax.
+
+### Problematic code:
+
+```sh
+echo ${"Hello World"}
+```
+
+### Correct code:
+
+```sh
+echo $"Hello World"
+```
+
+### Rationale:
+
+ShellCheck found a parameter expansion `${...}` that contains an unexpected syntax element, such as single or double quotes.
+
+In the example, this was due to wrapping a translated string `$".."` with curly braces, which is not valid.
+
+It is unclear what the intention is with invalid expansions like `${'foo'}`, `${$"foo"}`, so please look up how to do what you were trying to do.
+
+### Exceptions:
+
+If this warning triggers for working code, please [submit a bug](https://github.com/koalaman/shellcheck/issues/new).
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!