Create BG Script-BulkUpdateTable_Readme.md

Read me file for bulk update for the table

Author: TechTrekwithAJ

Background Scripts/Bulk Update Tables/BG Script-BulkUpdateTable_Readme.md

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+This Background will help to bulk update the incident table where 
+Finds all incidents that are:Active
+Have priority 3
+Have category = network
+Updates each of those records:
+Sets state = 2 (which usually means “In Progress”)
+Adds a comment: "Updated via bulk update script"
+Logs the number of records updated to the system logs.