Added functionality for General Settings Page (#1664)

* archive

* formmated code

* reverted changes to test class file.

* reverted changes to test file: reverted name

* added class models and updated link

* removed test console project

src/core/Microsoft.PowerToys.Settings.UI.Lib/GeneralSettings.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Microsoft.PowerToys.Settings.UI.ViewModels
+{
+    public class GeneralSettings
+    {
+        public bool packaged { get; set; }
+        public bool startup { get; set; }
+        public bool is_elevated { get; set; }
+        public bool run_elevated { get; set; }
+        public bool is_admin { get; set; }
+        public string theme { get; set; }
+        public string system_theme { get; set; }
+        public string powertoys_version { get; set; }
+
+        public override string ToString()
+        {
+            return JsonSerializer.Serialize(this);
+        }
+    }
+
+    public class OutGoingGeneralSettings
+    {
+        public GeneralSettings general { get; set; }
+
+        public OutGoingGeneralSettings()
+        {
+            this.general = null;
+        }
+
+        public OutGoingGeneralSettings(GeneralSettings generalSettings)
+        {
+            this.general = generalSettings;
+        }
+
+        public override string ToString()
+        {
+            return JsonSerializer.Serialize(this);
+        }
+    }
+}

src/core/Microsoft.PowerToys.Settings.UI.Lib/Microsoft.PowerToys.Settings.UI.Lib.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.Text.Json" Version="4.7.1" />
+  </ItemGroup>
+
+</Project>

src/core/Microsoft.PowerToys.Settings.UI.Lib/SettingsUtils.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using System.Text.Json;
+
+namespace Microsoft.PowerToys.Settings.UI.Lib
+{
+    public static class SettingsUtils
+    {
+        /// <summary>
+        /// Get path to the json settings file.
+        /// </summary>
+        /// <returns>string path.</returns>
+        public static string GetSettingsPath(string powertoy)
+        {
+            if(string.IsNullOrWhiteSpace(powertoy))
+            {
+                return Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+                    $"Microsoft\\PowerToys\\settings.json");
+            }
+            return Path.Combine(
+                Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+                $"Microsoft\\PowerToys\\{powertoy}\\settings.json");
+        }
+
+        /// <summary>
+        /// Get a Deserialized object of the json settings string.
+        /// </summary>
+        /// <returns>Deserialized json settings object.</returns>
+        public static T GetSettings<T>(string powertoy)
+        {
+            var jsonSettingsString = System.IO.File.ReadAllText(SettingsUtils.GetSettingsPath(powertoy));
+            return JsonSerializer.Deserialize<T>(jsonSettingsString);
+        }
+
+        /// <summary>
+        /// Save settings to a json file.
+        /// </summary>
+        /// <param name="settings">dynamic json settings object.</param>
+        public static void SaveSettings<T>(T settings, string powertoy)
+        {
+            if(settings != null)
+            {
+                System.IO.File.WriteAllText(
+                    SettingsUtils.GetSettingsPath(powertoy),
+                    settings.ToString());
+            }
+        }
+    }
+}