Created SC2265 (markdown)

SC2265.md

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+##  Use && for logical AND. Single & will background and return true.
+
+### Problematic code:
+
+```sh
+if [ "$1" = "install" ] & [ "$USER" != "root" ]
+then
+  echo "Must be root to install"
+fi
+```
+
+### Correct code:
+
+```sh
+if [ "$1" = "install" ] && [ "$USER" != "root" ]
+then
+  echo "Must be root to install"
+fi
+```
+### Rationale:
+
+ShellCheck found a `test` command followed by a `&`. This runs the test in the background, effectively ignoring it. To specify "logical AND" between two commands, use `&&`.
+
+### Exceptions:
+
+None
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!