docs: Document SDMLib migration

docs/sdmlib-migration.md

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+# Migrating from SDMLib
+
+SDMLib syntax can be migrated to fulib decorator syntax with a few regular expressions:
+
+> The examples assume a `ClassModelManager model` parameter.
+
+```regexp
+(\w+).(with|create)Attribute\(
+model.haveAttribute($1, 
+
+(\w+).(with|create)UniDirectional\((\w+), "(\w+)", (ONE|MANY)\)
+model.associate($1, "$3", $4, $2, null, 0)
+
+(\w+).(with|create)Bidirectional\((\w+), "(\w+)", (ONE|MANY), "(\w+)", (ONE|MANY)\)
+model.associate($1, "$3", $4, $2, "$5", $6)
+
+\)\.withSuperClazz\(
+, 
+```