FancyZones and Shortcut Guide initial commit

Co-authored-by: Alexis Campailla <alexis@janeasystems.com>
Co-authored-by: Bret Anderson <bretan@microsoft.com>
Co-authored-by: Enrico Giordani <enrico.giordani@gmail.com>
Co-authored-by: Jaime Bernardo <jaime@janeasystems.com>
Co-authored-by: Jeff Bogdan <jeffbog@microsoft.com>
Co-authored-by: March Rogers <marchr@microsoft.com>
Co-authored-by: Mike Harsh <mharsh@microsoft.com>
Co-authored-by: Nachum Bundak <Nachum.Bundak@microsoft.com>
Co-authored-by: Oliver Jones <ojones@microsoft.com>
Co-authored-by: Patrick Little <plittle@microsoft.com>

src/modules/fancyzones/editor/FancyZonesEditor/RowColInfo.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FancyZonesEditor
+{
+    public class RowColInfo
+    {
+        public RowColInfo(int percent)
+        {
+            Percent = percent;
+        }
+
+        public RowColInfo(int index, int count)
+        {
+            Percent = (c_multiplier / count) + ((index == 0) ? (c_multiplier % count) : 0);
+        }
+
+        private const int c_multiplier = 10000;
+
+        public double SetExtent(double start, double totalExtent)
+        {
+            Start = start;
+            Extent = totalExtent * Percent / c_multiplier;
+            End = Start + Extent;
+            return Extent;
+        }
+
+        public RowColInfo[] Split(double offset)
+        {
+            RowColInfo[] info = new RowColInfo[2];
+
+            int newPercent = (int)(Percent * offset / Extent);
+            info[0] = new RowColInfo(newPercent);
+            info[1] = new RowColInfo(Percent - newPercent);
+            return info;
+        }
+
+        public int Percent;
+        public double Extent;
+        public double Start;
+        public double End;
+    }
+}