Clarify the criteria of premium features (#106)

* add criteria

* revision

* revise second point

get-started/rw-premium-edition-intro.mdx

@@ -14,6 +14,13 @@ Both the RisingWave Community Edition and Premium Edition share the same underly
 
 ## Premium features
 
+The premium features are carefully selected based on the following criteria:
+
+- Seamless integration with proprietary or licensed open-source systems.
+- Advanced features that enhance development velocity and lower production deployment overhead.
+- Performance improvements for non-standard deployment environments.
+- Tailored features specifically requested by our paying customers.
+
 RisingWave Premium 1.0 is the first major release of this new edition with several high-impact features planned. The following is the initial list of premium features, which we have targeted "Premium Edition Feature" note in the documentation.
 
 ### SQL and security