#453 Added PostgreSQL initial db scripts (User) (#556)

* PostgreSQL initial commit of translation from SQL Server to PostgreSQL

* snake_case added.
set search path for schema.  schema qualified name no longer needed for creation and access of functions.

* Table DDL for PostgreSQL

src/Sql/PostgreSQL/Tables/collection.sql

@@ -0,0 +1,19 @@
+DROP TABLE IF EXISTS collection;
+
+CREATE TABLE IF NOT EXISTS collection (
+    id              UUID          NOT NULL,
+    organization_id UUID          NOT NULL,
+    name            TEXT          NOT NULL,
+    external_id     VARCHAR (300) NULL,
+    creation_date   TIMESTAMPTZ   NOT NULL,
+    revision_date   TIMESTAMPTZ   NOT NULL,
+    CONSTRAINT pk_collection PRIMARY KEY (id),
+    CONSTRAINT fk_collection_organization FOREIGN KEY (organization_id) REFERENCES organization (id) ON DELETE CASCADE
+);
+
+
+CREATE  INDEX ix_collection_organization_id_include_all
+    ON collection(organization_id ASC)
+    INCLUDE(creation_date, name, revision_date);
+
+