feat: enable adding relevant skills to events

WebApp/Mapping/EventSkillMapping.cs

@@ -0,0 +1,16 @@
+using WebApp.DTOs;
+using WebApp.Entities;
+
+namespace WebApp.Mapping;
+
+public static class EventSkillMapping
+{
+    public static EventSkill ToEventSkillEntity(this SingleSkillDto SSDto, int eid)
+    {
+        return new EventSkill()
+        {
+            EventId = eid,
+            SkillId = SSDto.Skill,
+        };
+    }
+}