Created SC1057 (markdown)

SC1057.md

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+## Did you forget the `do` for this loop?
+
+### Problematic code:
+
+```sh
+while read -r line
+  echo $line
+done
+```
+
+### Correct code:
+
+```sh
+while read -r line
+do
+  echo $line
+done
+```
+### Rationale:
+
+ShellCheck found a loop that appears to be missing its `do` statement. Make sure the loop syntax is correct.
+
+### Exceptions:
+
+None.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!