Created SC3037 (markdown)

SC3037.md

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+## In POSIX sh, echo flags are undefined.
+
+### Problematic code:
+
+```sh
+#!/bin/sh
+echo -ne 'Foo:\tBar'
+```
+
+### Correct code:
+
+Rewrite in terms of the more robust and standardized `printf`:
+
+```sh
+#!/bin/sh
+printf 'Foo:\tBar'
+```
+
+### Rationale:
+
+`echo` has historically behaved differently on different systems. Use `printf` instead to ensure compatibility between shells.
+
+### Exceptions:
+
+If you only intend to target shells that supports this feature, you can change
+the shebang to a shell that guarantees support, or [[ignore]] this warning.
+
+You can use `# shellcheck disable=SC3000-SC4000` to ignore all such compatibility
+warnings.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!