Created SC1055 (markdown)

SC1055.md

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+## You need at least one command here. Use 'true;' as a no-op.
+
+### Problematic code:
+
+```sh
+submitbug() {
+  # TODO: Implement me
+}
+```
+
+### Correct code:
+
+```sh
+submitbug() {
+  # TODO: Implement me
+  true
+}
+```
+### Rationale:
+
+ShellCheck found an empty code block. This could be an empty function as shown, a loop with an empty body, or similar.
+
+Sh/bash does not allow empty code blocks. Insert at least one command. If you don't want the block to do anything, `true` (aka `:`) is a good no-op.
+
+### Exceptions:
+
+None
+
+### Related resources:
+* [StackOverflow: Why cannot I define an empty function in shell?](https://stackoverflow.com/questions/39307615/why-cannot-i-define-an-empty-function-in-shell)