Added service record functionality.

External/Interfaces/IServiceRecordDataAccess.cs

@@ -0,0 +1,10 @@
+using CarCareTracker.Models;
+
+namespace CarCareTracker.External.Interfaces
+{
+    public interface IServiceRecordDataAccess
+    {
+        public List<ServiceRecord> GetServiceRecordsByVehicleId(int vehicleId);
+        public bool SaveServiceRecordToVehicle(ServiceRecord serviceRecord);
+    }
+}