Adds a new part category, used to classify inventory parts (e.g. Bearings, Filters, Gaskets) for filtering and reporting. 
Categories can be nested under a parent category via `parentPartCategoryId`, and `sortOrder` controls their display order within pickers and reports.

---
### Parameters
**partCategoryInfo** `Dictionary`<br />
<table class='dictionaryKeyTable'>
	<tbody>
 	<tr><td> - categoryName</td><td>String</td><td></td></tr>	
 	<tr><td> - enabled</td><td>Boolean</td><td></td></tr>	
 	<tr><td> - parentPartCategoryId</td><td>Integer</td><td></td></tr>	
 	<tr><td> - sortOrder</td><td>Integer</td><td></td></tr>	
	</tbody>
</table>

**userId** `Integer`:Id of the user executing the function<br />

---
### Returns
**partCategoryId** `Integer`<br />
**message** `String` None if success<br />

---
### Example
```python
# Add a new top-level "Bearings" part category
partCategoryInfo = {
						'categoryName': 'Bearings',
						'enabled': True,
						'parentPartCategoryId': None,
						'sortOrder': 10
					}
userId = system.kanoa.security.getIDPUserId({'userName': 'SYSTEM'})
partCategoryId, message = system.kanoa.inventory.addPartCategory(partCategoryInfo, userId)
print partCategoryId, message
```