Add Gear controller/service/repo and relations in db between Jumps and others objects

Back/skydiveLogs-api.Business/Interface/IGearService.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using skydiveLogs_api.Model;
+
+namespace skydiveLogs_api.Business.Interface
+{
+    public interface IGearService
+    {
+        IEnumerable<Gear> GetAllGears();
+
+        Gear GetGearById(int id);
+
+        void DeleteGearById(int id);
+
+        void UpdateGear(int id, Gear Gear);
+
+        void AddNewGear(Gear Gear);
+    }
+}