Created SC2269 (markdown)

SC2269.md

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+## This variable is assigned to itself, so the assignment does nothing.
+
+### Problematic code:
+
+```sh
+var="$var"
+```
+
+### Correct code:
+
+```sh
+# If the goal is to do nothing
+true
+```
+
+### Rationale:
+
+ShellCheck found a variable that is assigned to itself, e.g. `x=$x`. This obviously has no effect.
+
+Double check what the assignment was supposed to do. 
+
+### Exceptions:
+
+None.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!