Added package jsons to mods + updated related poco

ExampleMods/Mods/7UseMultipleClasses/SecondClass.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExampleMods.Mods._7UseMultipleClasses
+{
+    public class SecondClass
+    {
+        public string GetText()
+        {
+            return "test text";
+        }
+    }
+}

ExampleMods/Mods/7UseMultipleClasses/UseMultipleClasses.cs

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+using Core.Models.External;
+using Core.Models.Utils;
+
+namespace ExampleMods.Mods._7UseMultipleClasses
+{
+    /// <summary>
+    /// Having multiple classes can make keeping your code maintainable easier, you can split related code into their own class
+    /// </summary>
+    public class UseMultipleClasses: IPostDBLoadMod
+    {
+        private readonly ISptLogger<UseMultipleClasses> _logger;
+
+        public UseMultipleClasses(
+            ISptLogger<UseMultipleClasses> _logger)
+        {
+            this._logger = _logger;
+        }
+
+        public void PostDBLoad()
+        {
+            // We create an instance of the other class
+            var otherClass = new SecondClass();
+
+            // We call the "GetText" method that exists in the other class
+            var text = otherClass.GetText();
+
+            // Log the result to the server console
+            _logger.Info($"The SecondClass returned the text: {text}");
+        }
+    }
+}

ExampleMods/Mods/7UseMultipleClasses/package.json

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+{
+    "Name": "7UseMultipleClasses",
+    "Version": "1.0.0",
+    "SptVersion": "~4.0",
+    "LoadBefore": [],
+    "LoadAfter": [],
+    "IncompatibileMods": [],
+    "Url": "https://github.com/sp-tarkov/server-csharp/tree/develop/ExampleMods/Mods",
+    "IsBundleMod": false,
+    "Author": "SPT",
+    "Contributors": [],
+    "Licence": "MIT"
+}