Add NuGet package.

.gitignore

@@ -1 +1,2 @@
-/build/
+/build/
+Gettext.Tools.*.nupkg

Gettext.Tools.0.18.3.nuspec

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
+    <metadata>
+        <id>Gettext.Tools</id>
+        <version>0.18.3</version>
+        <title>GNU gettext tools for Windows</title>
+        <authors>Vaclav Slavik</authors>
+        <licenseUrl>https://github.com/vslavik/gettext-tools-windows/blob/master/LICENSE</licenseUrl>
+        <projectUrl>https://github.com/vslavik/gettext-tools-windows</projectUrl>
+        <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <description>Windows build of GNU gettext tools (msgfmt, xgettext etc.).</description>
+        <copyright>Copyright (C) Free Software Foundation, Inc. {http://fsf.org/}</copyright>
+        <language>en-US</language>
+        <tags>gnu gettext msgfmt xgettext msgmerge</tags>
+    </metadata>
+
+    <files>
+        <file src="build\dist\bin\*" target="tools" />
+        <file src="build\dist\license.txt" target="" />
+        <file src="build\dist\readme.txt" target="" />
+    </files>
+</package>