Update REFERENCE.md

Author: abjerner

REFERENCE.md

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 # Skybrud.Essentials
 
+## JSON
+
+### JsonUtils
+
+In Skybrud.Essentials, the static `JsonUtils` class comes with a number of helpful utility methods and other functionality for working with JSON (and [JSON.net](https://www.newtonsoft.com/json) in particular). 
+
+For instance, you can parse or load JSON objects using the `JsonUtils.ParseJsonObject` and `JsonUtils.LoadJsonObject` methods respectively:
+
+```c#
+@using Skybrud.Essentials.Json
+@{
+
+    // Parse a JSON object from a string
+    JObject json1 = JsonUtils.Parse("{\"hello\":\"world\"}");
+    
+    // Load a JSON object from a file on disk
+    JObject json2 = JsonUtils.Load("C:/path/to/file.json");
+
+}
+```
+
+The `JsonUtils.Parse` method does somewhat the same as `JObject.Parse`, but JSON.net's default settings will deserialize string properties that look like dates to actual instances of `DateTime` - which when serialized back to a JSON string might not look like the original string value. The `JsonUtils.Parse` will make sure that these values will stay as strings so the format wont change.
+
+The `JsonUtils.Load` will read from the file so you don't have to do this your self. The contents of the file is then passed on to the `JsonUtils.Parse` method, giving the same result as described above.
+
+### Converters
+
+Skybrud.Essentials also comes with a number of JSON converters. For instance, there are a number of ways to serialize an enum value. Default in JSON.net is to use the enum values numeric value, but this may not always be the desired result.
+
+So, if you wish to store your enum values using camel case (eg. `camelCase`), you can use the `EnumCamelCaseConverter` on your property or enum class. In a similar way, you can convert to Pascal case (eg. `PascalCase`) using `EnumPascalCaseConverter`, and to lower case (eg. `lowercase`) using `EnumLowerCaseConverter`.
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 ## Time
 
 ###  EssentialsDateTime