Start work on Inventory System

Server/Inventory/Interfaces/IDroppableItem.cs

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+using GTANetworkAPI;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+/**
+* @overview Life of German Reallife - Inventory Interfaces DroppableItem (IDroppableItem.cs)
+* @author VegaZ
+* @copyright (c) 2008 - 2018 Life of German
+*/
+
+namespace reallife_gamemode.Server.Inventory.Interfaces
+{
+    public interface IDroppableItem
+    {
+        void Drop(Client player);
+    }
+}

Server/Inventory/Interfaces/IItem.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+/**
+* @overview Life of German Reallife - Inventory Interfaces Item (IItem.cs)
+* @author VegaZ
+* @copyright (c) 2008 - 2018 Life of German
+*/
+
+namespace reallife_gamemode.Server.Inventory.Interfaces
+{
+    public interface IItem
+    {
+        int Id { get; }
+        string Name { get; }
+        string Description { get; }
+        int Gewicht { get; }
+        string Einheit { get; }
+    }
+}

Server/Inventory/Interfaces/IUsableItem.cs

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+using GTANetworkAPI;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+/**
+* @overview Life of German Reallife - Inventory Interfaces UsableItem (IUsableItem.cs)
+* @author VegaZ
+* @copyright (c) 2008 - 2018 Life of German
+*/
+
+namespace reallife_gamemode.Server.Inventory.Interfaces
+{
+    public interface IUsableItem
+    {
+        void Use(Client player);
+    }
+}

Server/Inventory/Items/FoodItem.cs

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+using GTANetworkAPI;
+using reallife_gamemode.Server.Inventory.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace reallife_gamemode.Server.Inventory.Items
+{
+    public abstract class FoodItem : IUsableItem
+    {
+        public abstract int HpAmount { get; }
+
+        public void Use(Client player)
+        {
+            player.Health += HpAmount;
+        }
+    }
+}

Server/Inventory/Items/Hamburger.cs

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+using reallife_gamemode.Server.Inventory.Interfaces;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+/**
+* @overview Life of German Reallife - Inventory Items Hamburger (Hamburger.cs)
+* @author VegaZ
+* @copyright (c) 2008 - 2018 Life of German
+*/
+
+namespace reallife_gamemode.Server.Inventory.Items
+{
+    public class Hamburger : FoodItem, IItem
+    {      
+        public int Id => 1;
+        public string Name => "Hamburger";
+        public string Description => "Ein leckerer Hamburger.";
+        public int Gewicht => 300;
+        public string Einheit => "g";
+        public override int HpAmount => 50;
+    }
+}