Update apps-add.md - Category information

The MS docs don't say what the max number of categories you can create is.
Today, I found it number out with a script. The number is 200.

Added a note.

memdocs/intune/apps/apps-add.md

@@ -202,6 +202,9 @@ When you add an app to Intune, you're given the option to select the category yo
     - To edit a category, select the ellipsis (**...**) next to the category, and then select **Pin to dashboard** or **Delete**.
 4. Select **Create**.
 
+> [!NOTE]
+> The maximum number of App Categories you can create is 200.
+
 ## Apps that are added automatically by Intune
 
 Previously, Intune contained a number of built-in apps that you could quickly assign. Based on Intune customer feedback, we removed this list, and the built-in apps are no longer displayed. However, if you have already assigned any built-in apps, the apps remain visible in the list of apps. You can continue to assign the apps as required.