Add DBMS support question to FAQ

Author: Iain-S

docs/source/faq.rst

@@ -1,7 +1,17 @@
 FAQ
 ===
 
-Can sqlsynthgen work with two different schemas
-***********************************************
+Can SqlSynthGen work with two different schemas?
+************************************************
 
-sqlsynthgen can only work with a single source schema and a single destination schema at a time. However, you can choose for the destination schema to have a different name to the source schema by setting the DST_SCHEMA environment variable.
+SqlSynthGen can only work with a single source schema and a single destination schema at a time.
+However, you can choose for the destination schema to have a different name to the source schema by setting the DST_SCHEMA environment variable.
+
+Which DBMSs does SqlSynthGen support?
+*************************************
+
+* SqlSynthGen most fully supports **PostgresSQL**, which it uses for its end-to-end functional tests.
+* SqlSynthGen also supports **MariaDB** with one exception: you cannot use source statistics (i.e. the ``make-stats`` command).
+* SqlSynthGen *might*, work with **SQLite** but this is largely untested.
+
+Please open a GitHub issue if you would like to see support for another DBMS.