Created SC1084 (markdown)

SC1084.md

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+## Use #!, not !#, for the shebang.
+
+### Problematic code:
+
+    !#/bin/sh
+    echo "Hello World"
+
+### Correct code:
+
+    #!/bin/sh
+    echo "Hello World"
+
+### Rationale:
+
+The shebang has been accidentally swapped. The `#` should come first: `#!`, not `!#`. 
+
+### Contraindications
+
+None.