Added NuGet specification file

Author: NikolayIT

GenCode128.nuspec

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
+    <metadata>
+        <id>GenCode128</id>
+        <version>1.0.0</version>
+        <title>GenCode128 - A Code128 Barcode Generator</title>
+        <authors>Nikolay.IT,Chris Wuestefeld</authors>
+        <projectUrl>https://github.com/SourceCodeBackup/GenCode128</projectUrl>
+        <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <description>This is a simple library that lets you do one thing very easily: generate an Image for a Code128 barcode, with a single line of code. This image is suitable for print or display in a WPF, WinForms and ASP.NET applications.</description>
+        <releaseNotes>Original as-is version from Chris Wuestefeld targeting .NET 2.0. Only code improvements added.</releaseNotes>
+        <tags>Barcode, GenCode128, Code128, generate barcode</tags>
+    </metadata>
+    <files>
+        <file src="Source\GenCode128\bin\Release\GenCode128.dll" target="lib\GenCode128.dll" />
+    </files>
+</package>