Created SC2192 (markdown)

SC2192.md

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+## This array element has no value. Remove spaces after = or use "" for empty string.
+### Problematic code:
+
+```sh
+array=([1]=one [2]= two)
+```
+
+### Correct code:
+
+```sh
+array=([1]=one [2]=two)
+```
+### Rationale:
+
+You have an array element on the form `[index]=`. The shell will interpret this as an independent element with index `index` and value `<empty string>`.
+
+This may happen as part of the expression `[index]= value`, where the space is not allowed and causes the shell to interpret it as `[index]="" [index+1]=value`.
+
+If you wanted the element to have a value, remove the spaces after `=`, e.g. `[index]=value`.
+
+If you wanted to assign an empty string, explicitly use emtpy quotes: `[index]=""`. This makes no difference to the shell, but will make your intention clear to shellcheck and other humans. 
+
+### Exceptions:
+
+None.