Adding splitter between designer and properties

src/components/workflows/Readme.md

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+# id
+
+**Workflow Designer ids**:
+
+using `_id={WORKFLOW_DESIGNER_INSTANCE_ID}{session['user_id']}{get_unique_id()}`
+
+| Name       | value          |
+|------------|----------------|
+| Canvas     | `c_{self._id}` |
+| Designer   | `d_{self._id}` |
+| Properties | `p_{self._id}` |
+| Spliter    | `s_{self._id}` |