Created SC2292 (markdown)

SC2292.md

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+## Prefer [[ ]] over [ ] for tests in Bash/Ksh.
+
+This is an [[optional]] suggestion. It must be explicitly enabled with a [[directive]] `enable=require-double-brackets` in a `# shellcheck` comment or `.shellcheckrc`
+
+### Problematic code:
+
+```sh
+[ -e /etc/issue ] 
+```
+
+### Correct code:
+
+```sh
+[[ -e /etc/issue ]]
+```
+
+### Rationale:
+
+ShellCheck has been explicitly asked to warn about uses of `[ .. ]` in favor of the extended Bash/Ksh test `[[ .. ]]`.
+
+`[[ .. ]]` suppresses word splitting and globbing, supports a wider variety of tests, and is generally safer and better defined than `[ .. ]`. For an in-depth list of differences, see the Related Resources. 
+
+### Exceptions:
+
+This check is not enabled by default, and may have been turned on for your current project by someone who wants it enforced. You can still [[ignore]] it with a directive.
+
+This suggestion does not trigger for Sh or Dash scripts, even when explicitly enabled, as these shells don't support `[[ .. ]]`. 
+
+### Related resources:
+
+* BashFAQ 031: [What is the difference between test, \[ and \[\[ ?](https://mywiki.wooledge.org/BashFAQ/031)