Add project files.

TestWinFormsDataVis/StraightLine.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TestWinFormsDataVis
+{
+    public class StraightLine
+    {
+        public int start_x { get; set; }
+        public int start_y { get; set; }
+        public int end_x { get; set; }
+        public int end_y { get; set; }
+    }
+}