Created SC2195 (markdown)

SC2195.md

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+## This pattern will never match the case statement's word. Double check them.
+
+### Problematic code:
+
+```sh
+case "$var " of      # Trailing space
+  value) echo "Match"
+esac
+```
+
+### Correct code:
+
+```sh
+case "${var}" of     # No trailing space
+  value) echo "Match"
+esac
+```
+### Rationale:
+
+ShellCheck has detected that one of the patterns in a `case` statement will never match. 
+
+Often, this is due to mistaes in the case statement word that results in unintended literal characters. In the problematic code, there's a trailing space that will prevent the match from ever happening.
+
+For more examples of when this could happen, see [SC2193](https://github.com/koalaman/shellcheck/wiki/SC2193) for the equivalent warning for `[[ .. ]]` statements.
+
+Note that ShellCheck warns about individual patterns in a branch, and will flag `*.png` in this example even though the branch is not dead:
+
+```
+case "${img}.jpg" in
+  *.png | *.jpg) echo "It's an image"
+esac
+```
+
+### Exceptions:
+
+None. If you encounter a bug and wish to [[ignore]] this warning, make sure the directive goes in front of the `case` and not the individual branch.