Added the sample for multiple trackball #1

Saravanan-Madhesh merged 9 commits intomasterSyncfusionExamples/How-to-Add-Multiple-Trackballs-in-a-WPF-SfChart:masterfrom

KB-917142-SfChartMultipleTrackballsSyncfusionExamples/How-to-Add-Multiple-Trackballs-in-a-WPF-SfChart:KB-917142-SfChartMultipleTrackballsCopy head branch name to clipboard