quite a bit, too much to summarize here

packages/Newtonsoft.Json.13.0.3/LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) 2007 James Newton-King
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

packages/Newtonsoft.Json.13.0.3/README.md

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+# ![Logo](https://raw.githubusercontent.com/JamesNK/Newtonsoft.Json/master/Doc/icons/logo.jpg) Json.NET
+
+[![NuGet version (Newtonsoft.Json)](https://img.shields.io/nuget/v/Newtonsoft.Json.svg?style=flat-square)](https://www.nuget.org/packages/Newtonsoft.Json/)
+[![Build status](https://dev.azure.com/jamesnk/Public/_apis/build/status/JamesNK.Newtonsoft.Json?branchName=master)](https://dev.azure.com/jamesnk/Public/_build/latest?definitionId=8)
+
+Json.NET is a popular high-performance JSON framework for .NET
+
+## Serialize JSON
+
+```csharp
+Product product = new Product();
+product.Name = "Apple";
+product.Expiry = new DateTime(2008, 12, 28);
+product.Sizes = new string[] { "Small" };
+
+string json = JsonConvert.SerializeObject(product);
+// {
+//   "Name": "Apple",
+//   "Expiry": "2008-12-28T00:00:00",
+//   "Sizes": [
+//     "Small"
+//   ]
+// }
+```
+
+## Deserialize JSON
+
+```csharp
+string json = @"{
+  'Name': 'Bad Boys',
+  'ReleaseDate': '1995-4-7T00:00:00',
+  'Genres': [
+    'Action',
+    'Comedy'
+  ]
+}";
+
+Movie m = JsonConvert.DeserializeObject<Movie>(json);
+
+string name = m.Name;
+// Bad Boys
+```
+
+## LINQ to JSON
+
+```csharp
+JArray array = new JArray();
+array.Add("Manual text");
+array.Add(new DateTime(2000, 5, 23));
+
+JObject o = new JObject();
+o["MyArray"] = array;
+
+string json = o.ToString();
+// {
+//   "MyArray": [
+//     "Manual text",
+//     "2000-05-23T00:00:00"
+//   ]
+// }
+```
+
+## Links
+
+- [Homepage](https://www.newtonsoft.com/json)
+- [Documentation](https://www.newtonsoft.com/json/help)
+- [NuGet Package](https://www.nuget.org/packages/Newtonsoft.Json)
+- [Release Notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
+- [Contributing Guidelines](https://github.com/JamesNK/Newtonsoft.Json/blob/master/CONTRIBUTING.md)
+- [License](https://github.com/JamesNK/Newtonsoft.Json/blob/master/LICENSE.md)
+- [Stack Overflow](https://stackoverflow.com/questions/tagged/json.net)