Created SC2291 (markdown)

SC2291.md

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+## Quote repeated spaces to avoid them collapsing into one.
+
+### Problematic code:
+
+```sh
+echo Hello        World
+```
+
+### Correct code:
+
+```sh
+echo "Hello        World"
+```
+
+### Rationale:
+
+ShellCheck found multiple unquoted spaces between words passed to `echo`. Due to the way arguments are interpreted and passed in the shell, these will collapse into a single space:
+
+```
+$ echo Hello        World
+Hello World
+```
+
+If you want to output multiple spaces, such as when creating a notice or banner, make sure the spaces are quoted, e.g. by adding (or extending) double quotes to include them:
+
+```
+$ echo "Hello        World"
+Hello        World
+```
+
+### Exceptions:
+
+If you're aware of this behavior and didn't want multiple spaces to show up in the output, you can either remove the unnecessary spaces or [[ignore]] this issue.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!