Update README.md

README.md

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 # MimeTypeList
+Provides a hard-coded collection of file extension and mime type mapping. This project was inspired by [samuelneff/MimeTypeMap](https://github.com/samuelneff/MimeTypeMap). This project uses the data from that project to create classes with members for each extension and mime type for lookups.
+
+You can access the values with the `FileExtensions` and `MimeTypes` static classes:
+
+```c#
+FileExtensions._ruleset
+MimeTypes.application.onenote
+```
+
+## Installation 
+
+You can install MimeTypeList from [Nuget.org](https://www.nuget.org/).
+
+## Usage
+
+After installation MimeTypeList, include the following using statement in your class:
+
+```cs
+using MimeTypeList;
+```
+
+### Getting Extensions
+
+```cs
+Console.WriteLine(MimeTypes.application.onenote); // ".one"
+```
+
+### Getting Mime Types
+
+```cs
+Console.WriteLine(FileExtensions._ruleset); // "application/xml"
+```