Add project files.

GZStudio.Core/Contracts/Services/IFileService.cs

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+namespace GZStudio.Core.Contracts.Services;
+
+public interface IFileService
+{
+    T Read<T>(string folderPath, string fileName);
+
+    void Save<T>(string folderPath, string fileName, T content);
+
+    void Delete(string folderPath, string fileName);
+}

GZStudio.Core/GZStudio.Core.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <RootNamespace>GZStudio.Core</RootNamespace>
+    <Platforms>AnyCPU;x64;x86</Platforms>
+    <Platforms>x86;x64;arm64;AnyCPU</Platforms>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
+  </ItemGroup>
+</Project>

GZStudio.Core/Helpers/Json.cs

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+using Newtonsoft.Json;
+
+namespace GZStudio.Core.Helpers;
+
+public static class Json
+{
+    public static async Task<T> ToObjectAsync<T>(string value)
+    {
+        return await Task.Run<T>(() =>
+        {
+            return JsonConvert.DeserializeObject<T>(value);
+        });
+    }
+
+    public static async Task<string> StringifyAsync(object value)
+    {
+        return await Task.Run<string>(() =>
+        {
+            return JsonConvert.SerializeObject(value);
+        });
+    }
+}

GZStudio.Core/README.md

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+*Recommended Markdown Viewer: [Markdown Editor](https://marketplace.visualstudio.com/items?itemName=MadsKristensen.MarkdownEditor2)*
+
+## Getting Started
+
+The Core project contains code that can be [reused across multiple application projects](https://docs.microsoft.com/dotnet/standard/net-standard#net-5-and-net-standard).

GZStudio.Core/Services/FileService.cs

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+using System.Text;
+
+using GZStudio.Core.Contracts.Services;
+
+using Newtonsoft.Json;
+
+namespace GZStudio.Core.Services;
+
+public class FileService : IFileService
+{
+    public T Read<T>(string folderPath, string fileName)
+    {
+        var path = Path.Combine(folderPath, fileName);
+        if (File.Exists(path))
+        {
+            var json = File.ReadAllText(path);
+            return JsonConvert.DeserializeObject<T>(json);
+        }
+
+        return default;
+    }
+
+    public void Save<T>(string folderPath, string fileName, T content)
+    {
+        if (!Directory.Exists(folderPath))
+        {
+            Directory.CreateDirectory(folderPath);
+        }
+
+        var fileContent = JsonConvert.SerializeObject(content);
+        File.WriteAllText(Path.Combine(folderPath, fileName), fileContent, Encoding.UTF8);
+    }
+
+    public void Delete(string folderPath, string fileName)
+    {
+        if (fileName != null && File.Exists(Path.Combine(folderPath, fileName)))
+        {
+            File.Delete(Path.Combine(folderPath, fileName));
+        }
+    }
+}