Add InputDeviceIconSetSO configuration guide and related documentation

- Created a new markdown file detailing the configuration of InputDeviceIconSetSO.
- Included sections on system architecture, field explanations, image specifications, and complete workflow from setup to runtime.
- Documented the automatic device recognition logic and provided troubleshooting for common issues.
- Added references to relevant files and scripts for easier navigation.

Assets/_Game/Scenes/Testings/FengXianMountain.unity

@@ -31682,6 +31682,14 @@ PrefabInstance:
     serializedVersion: 3
     m_TransformParent: {fileID: 783576435}
     m_Modifications:
+    - target: {fileID: 2660590327737104237, guid: dadbcefa02b3d0f4ba27af93ff088166, type: 3}
+      propertyPath: _formSkillSets.Array.size
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 3038514324348343369, guid: dadbcefa02b3d0f4ba27af93ff088166, type: 3}
+      propertyPath: _debugValidateTransitions
+      value: 0
+      objectReference: {fileID: 0}
     - target: {fileID: 6834103521996502824, guid: dadbcefa02b3d0f4ba27af93ff088166, type: 3}
       propertyPath: m_Name
       value: Player