Created SC1019 (markdown)

SC1019.md

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+## Expected this to be an argument to the unary condition.
+
+### Problematic code:
+
+```sh
+[ -x ]
+```
+
+### Correct code:
+
+```sh
+[ -x "myfile" ]
+```
+### Rationale:
+
+ShellCheck has found a unary test operator that does not appear to be followed by a valid shell word. 
+
+This could be because of a misplaced `]`, `)`, or a missing space before the `]`.
+
+Check the syntax, make sure the test operator has an operand, and try again.
+
+### Exceptions:
+
+None.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!