add FAQ section to README with an exlanation of the "list of single-entry dictionaries" pattern (#290)

Author: slayoo

.github/workflows/tests+pypi.yml

@@ -193,6 +193,8 @@ jobs:
     needs: [build]
     steps:
     - uses: actions/setup-python@v2
+      with:
+        python-version: "3.11"
     - run: pip install twine auditwheel
     - uses: actions/download-artifact@v2
       with:

README.md

@@ -209,6 +209,11 @@ flowchart TD
     style PartMC fill:#7ae7ff,stroke-width:2px,color:#2B2B2B
 ```
 
+## FAQ
+
+- Q: Why some of the constructors expect data to be passed as **lists of single-entry dictionaries** instead of multi-element dictionaries?    
+  A: This is intentional and related with PartMC relying on the order of elements within spec-file input; while Python dictionaries preserve ordering (insertion order), JSON format does not, and we intend to make these data structures safe to be [de]serialized using JSON.   
+
 ## Troubleshooting 
 
 #### Common installation issues