Created SC1049 (markdown)

SC1049.md

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+## Did you forget the 'then' for this 'if'?
+
+### Problematic code:
+
+```sh
+if true
+  echo "foo"
+elif true
+  echo "bar"
+fi
+```
+
+### Correct code:
+
+```sh
+if true
+then
+  echo "foo"
+elif true
+then
+  echo "bar"
+fi```
+
+### Rationale:
+
+ShellCheck found a parsing error in the script, and determined that it's most likely due to a missing `then` keyword for the `if` or `elif` indicated.
+
+Make sure the `then` is there. It needs `;` or linefeed before it (e.g. `if true; then`, not `if true then`).
+
+### Exceptions:
+
+None