Adds Configuration Manager + tests

Core/Configurations/ConfigurationManager/JsonConfigurationSection.cs

@@ -0,0 +1,56 @@
+using Newtonsoft.Json.Linq;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Primitives;
+using System.Data;
+
+namespace Configuration.Core;
+public class JsonConfigurationSection : IConfigurationSection
+{
+    private readonly JObject _data;
+    private readonly string _path;
+
+    public JsonConfigurationSection(JObject data, string path)
+    {
+        _data = data;
+        _path = path;
+    }
+
+    public string this[string key]
+    {
+        get => _data.SelectToken($"{_path.Replace(":", ".")}.{key.Replace(":", ".")}")?.ToString();
+        set => throw new NotImplementedException();
+    }
+
+    public string Key => _path.Split(':').Last();
+    public string Path => _path;
+    public string Value
+    {
+        get => _data.SelectToken(_path.Replace(":", "."))?.ToString();
+        set => throw new NotImplementedException();
+    }
+
+
+    public IConfigurationSection GetSection(string key) =>
+        new JsonConfigurationSection(_data, string.IsNullOrEmpty(_path) ? key : $"{_path}:{key}");
+
+    public JToken GetToken() => _data.SelectToken(_path.Replace(":", "."));
+
+    public IEnumerable<IConfigurationSection> GetChildren()
+    {
+        var token = _data.SelectToken(_path.Replace(":", "."));
+        if (token is JObject obj)
+        {
+            return obj.Properties()
+                .Select(p => new JsonConfigurationSection(_data,
+                    string.IsNullOrEmpty(_path) ? p.Name : $"{_path}:{p.Name}"));
+        }
+        return Enumerable.Empty<IConfigurationSection>();
+    }
+    public T Get<T>() where T : class
+    {
+        var token = _data.SelectToken(_path.Replace(":", "."));
+        return token?.ToObject<T>();
+    }
+
+    public IChangeToken GetReloadToken() => new ConfigurationReloadToken();
+}