Merge branch '626-add-nullable-true-to-all-properties-that-can-have-null-values' of https://github.com/plantbreeding/BrAPI into 626-add-nullable-true-to-all-properties-that-can-have-null-values

Author: Guy Davenport

Specification/BrAPI-Schema/README.md

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+## JSON Specification 
+
+The BrAPI Specification defined as a JSON Schema. The schema is 
+defined in individual files per Entity in separate models.
+Some files contain more than one definition where the entity has
+Value Types that are used only by entity. 
+
+[BrAPI-Common](./BrAPI-Common) contains definitions that are used the
+accose the four main.
+
+[Requests](./Requests) defines the query model in the form of request 
+object definitions for the primary entity models. 
+Shared parameters and object definition between these definitions are placed in the
+[Parameters](./Requests/Parameters) and [Schemas](./Requests/Schemas) 
+directories respectively.

Specification/BrAPI-Schema/Requests/Parameters/README.md

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+## Request parameters 
+
+This directory contains parameters shared between [Requests](../). 

Specification/BrAPI-Schema/Requests/Schemas/README.md

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+## Request object definitions
+
+This directory contains object definitions shared between [Requests](../).