Add adr

docs/adr/adr-008-field-names.md

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+### ADR - 008: Field Names
+
+We are changing the schema to reflect the way the data is stored in CORE. 
+This is due to the SPSS queries that are being performed by ADD and the complexity that would come with changing them.
+
+The field names are saved lowercase as opposed to the uppercase versions we see in CORE.
+This is due to Ruby expecting the uppercase parameters to be constants and database fields are expected to be lower case.
+These fields could be mapped to their uppercase versions during the replication if needed. 
+
+A lot of the values are now also being stored as enums. 
+This gives as some validation by default as the values not defined in the enums will fail to save.