Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -37,6 +37,15 @@ And you can also trigger the run in the Gradle panel of IDEA:
 
 ![image](https://user-images.githubusercontent.com/8344245/220255351-8bd2db47-9e4b-407c-9444-ac982173f77b.png)
 
+### Design a new feature/solution/architecture upgrade
+
+*Drafting.* If you are going to apply a huge change to the code, to minimize the possible impact and code review pressure, here are some guide on the general steps we can follow:
+- Create a new PR for UML update to clarify/illustrate the changes on class relations and new interface definitions.
+- Create a PR to check in the interfaces and abstract classes, and create some unit test to define the behavior of the entities/components.
+- Start the PR(s) for implementation and tweak the UT during the process. 
+
+Ideally, the above steps could help you win incremental approval from the team and 
+
 ## Coding style conventions
 
 Under most cases, new file/folder name should follow the [snake case](https://en.wikipedia.org/wiki/Snake_case) style patterns. A fully capitalized name should come with a reasonable justification.