Created SC1089 (markdown)

SC1089.md

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+## Parsing stopped here. Is this keyword correctly matched up?
+
+### Problematic code:
+
+    if true
+    then
+      echo hello
+    fi
+    fi
+
+### Correct code:
+
+    if true
+    then
+      echo hello
+    fi
+
+### Rationale:
+
+This error is typically seen when there are too many `fi`, `done` or `esac`s, or when there's a `do` or `then` without a corresponding `while`, `for` or `if`. This is often due to deleting a loop or conditional statement but not its terminator.
+
+In some cases, it can even be caused by bad quoting:
+
+    var="foo
+    if [[ $var = "bar ]
+    then
+      echo true
+    fi
+
+In this case, the `if` ends up inside the double quotes, leaving the `then` dangling.
+
+### Exceptions:
+
+None.