Add frequently asked questions about wheels (#1478)

FAQ.rst

@@ -1,6 +1,23 @@
 Frequently asked questions and answers
 ======================================
 
+Can you add X format support in the Fiona wheels?
+-------------------------------------------------
+
+The short answer is no, unless the question is about a completely builtin format driver with no extra library dependencies.
+
+The wheels on PyPI are already painfully big at 17-24 MB. Adding Xerces (for GML) and libkml, for example, increases the size
+of wheels and encumbers everyone whether they use these formats or not. That's one reason why the answer is no. The other
+reason is the expense of maintaining and updating Fiona's wheel building infrastructure. Unlike conda-forge, which is a
+fiscally sponsored project of NumFOCUS, the Fiona project has no budget for building wheels. We're at the limit of what we
+can do for free on volunteer time.
+
+Can you publish Fiona wheels for new platform X?
+------------------------------------------------
+
+The short answer is not until there is free native CI for that platform. Even then, the project may be slow to add a new platform
+to the existing matrix. As explained above, the project has no funding for building wheels.
+
 What does "ValueError: Invalid field type <class 'cx_Oracle.LOB'>" mean?
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