Refactor data layer, add business layer

DataLayer/scripts/crud/USP_GetAllUserAccounts.sql

@@ -0,0 +1,17 @@
+
+CREATE OR ALTER PROCEDURE usp_GetAllUserAccounts
+AS
+BEGIN
+    SET NOCOUNT ON;
+
+    SELECT UserAccountID,
+           Username,
+           FirstName,
+           LastName,
+           Email,
+           CreatedAt,
+           UpdatedAt,
+           DateOfBirth,
+           Timer
+    FROM dbo.UserAccount;
+END;