initial

COA.EnterpriseServices.DataAccess/COA.EnterpriseServices.DataAccess.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

COA.EnterpriseServices.DataAccess/IDataAccess.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+
+namespace COA.EnterpriseServices.DataAccess
+{
+    public interface IDataAccess<T> where T : IRecord
+    {
+        bool Add(T item);
+
+        bool Update(T item);
+
+        ICollection<T> Get(int id);
+
+        ICollection<T> Get(Expression<Func<T, bool>> query);
+    }
+}

COA.EnterpriseServices.DataAccess/IRecord.cs

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+namespace COA.EnterpriseServices.DataAccess
+{
+    public interface IRecord
+    {
+        int Id { get; set; }
+    }
+}