update README

Author: jian-dong

README.MD

@@ -253,6 +253,8 @@ The following are the launch parameters available:
   recognized as USB 2.0. It is recommended to set this parameter to `false` when using a USB 2.0 connection to avoid
   unnecessary resets.
 
+**IMPORTANT**: *Please carefully read the instructions regarding software filtering settings at [this link](https://www.orbbec.com/docs/g330-use-depth-post-processing-blocks/). If you are uncertain, do not modify these settings.*
+
 ## Predefined presets
 
 | Preset         | Features                                                                                                                                                                                                      | Recommended use cases                                                                                                                                         |