Nuget release changes (#10)

* nuspec added.

* NuGet badge added to README.

Signed-off-by: Michael Valdron <michael.valdron@gmail.com>

Author: michael-valdron

DirectoryTree/DirectoryTree.csproj

@@ -62,6 +62,7 @@
     </Compile>
   </ItemGroup>
   <ItemGroup>
+    <None Include="DirectoryTree.nuspec" />
     <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>

DirectoryTree/DirectoryTree.nuspec

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package >
+  <metadata>
+    <id>$id$</id>
+    <version>$version$</version>
+    <title>$title$</title>
+    <authors>$author$</authors>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <license type="expression">MIT</license>
+    <!-- <icon>icon.png</icon> -->
+    <projectUrl>https://github.com/michael-valdron/directory-tree</projectUrl>
+    <description>$description$</description>
+    <releaseNotes>First release of the DirectryTree .NET control.</releaseNotes>
+    <copyright>$copyright$</copyright>
+    <tags>control directory tree directorytree directorychooser</tags>
+	<readme>docs\README.md</readme>
+  </metadata>
+  <files>
+    <file src="..\README.md" target="docs\" />
+  </files>
+</package>

README.md

@@ -1,5 +1,6 @@
 # Directory Tree
 
 [![Testing CI](https://github.com/michael-valdron/directory-tree/actions/workflows/testing.yml/badge.svg)](https://github.com/michael-valdron/directory-tree/actions/workflows/testing.yml)
+[![Nuget](https://img.shields.io/nuget/v/DirectoryTree)](https://www.nuget.org/packages/DirectoryTree)
 
 A user control for .NET which expands on the TreeView control to give the ability to reperesent a directory structure.