Created DataFields.md as reference for data fields

doc/DataFields.md

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+#Overview
+
+This page provides details on the data fields that help define the resources or objects that SMART is built to serve.
+
+The names of the fields represent the corresponding columns in the database and are identical to the name of the fields in each API call.
+
+While we will try to keep this up-to-date, discrepancies will inevitably kick in. We'd like to ask that if you find a discrepancy or inaccuracies, then please let us know at [The Product Works](http://www.theproduct.works/about-us/)
+
+#Contents
+
+- [Baby Fields](#baby-fields)
+
+## Pregnancy Fields
+
+Table "public.pregnancy"
+
+         Column          |          Type          |                       Details
+-------------------------|------------------------|--------------------------------------------------------
+ estimated_delivery_date | date                   | YYYY-MM-DD
+ additional_info         | character varying(500) | _TBC_
+ birth_mode              | character varying(50)  | One or more of the following: Svd \| Ventose \| Forceps \| Failed Ventose \| Failed forceps \| LSCS \|
+ perineum                | perineum_choice        | Single selection from following options: Intact \| 1 degree with sutures \| 1 degree without sutures \| 2 degree \| 3 degree \| 4 degree
+ service_user_id         | integer                | Internal ID of the mother's record
+ anti_d                  | character varying(50)  | _TBC_
+ created_at              | date                   | not null
+ last_menstrual_period   | date                   |
+ feeding                 | feeding_types          | Single selection from: Breast \| bottle \| Mixed
+
+ [Top of page ↑](#overview)
+
+##Baby Fields
+
+ Table "public.baby"
+
+         Column         |            Type             | Details 
+------------------------|-----------------------------|---------------------------------------------------
+ hospital_number        | character varying(40)       | Standard format, i.e. "H3nnnnnnn", where n=[0-9]
+ gender                 | character varying(10)       | Male \| Female
+ weight                 | integer                     | Stored in grams; should be displayed as kilograms to 2 decimal places
+ delivery_date_time     | timestamp without time zone | YYYY-MM-DD HH:MM:SS (e.g. 2014-09-09 13:45:00"
+ vitamin_k              | character varying(20)       | _null_ \| Oral \| IM \| Declined \| N/A
+ hearing                | character varying(30)       | _null_ \| Complete \| Appt Given \| Declined
+ newborn_screening_test | character varying(15)       | _null_ \| Done \| Declined
+ name                   | character varying(40)       | _null_ \| Conor!
+ birth_outcome          | character varying(20)       | _null_ \| Liveborn \| Stillborn \| Neo-natal death \| Complete Miss \| Incomplete Miss \| Ectopic \| TOP
+
+ [Top of page ↑](#overview)