Create ReactiveAnimation.nuspec

Added nuspec file (metadata for creating NuGet package)

ReactiveAnimation.nuspec

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+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
+    <metadata>
+        <id>ReactiveAnimation</id>
+        <version>1.0.14</version>
+        <title>Reactive Animation</title>
+        <authors>Keith Hall</authors>
+        <owners>Keith Hall</owners>
+        <licenseUrl>http://opensource.org/licenses/Apache-2.0</licenseUrl>
+        <projectUrl>https://github.com/keith-hall/reactive-animation</projectUrl>
+        <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <description>Small, simple C# animation library built using the reactive extensions framework, utilizing Robert Penner's easing functions.  Does not make use of reflection, instead allowing the caller to use a function/monad to update their desired object.  Contains methods for animating Windows Forms Controls.
+
+Includes full source code and a LINQPad sample.</description>
+        <summary>C# animation library built using the reactive extensions framework</summary>
+        <releaseNotes />
+        <language>en-GB</language>
+        <tags>animation tween linqpad-samples Reactive Rx LINQ Observable Events</tags>
+        <dependencies>
+            <group targetFramework=".NETFramework4.5">
+                <dependency id="Rx-Main" version="2.2.5" />
+                <dependency id="Rx-WinForms" version="2.2.5" />
+            </group>
+        </dependencies>
+        <frameworkAssemblies>
+            <frameworkAssembly assemblyName="System.Windows.Forms" targetFramework=".NETFramework4.5" />
+            <frameworkAssembly assemblyName="System.Drawing" targetFramework=".NETFramework4.5" />
+        </frameworkAssemblies>
+    </metadata>
+    <files>
+        <file src="lib\net45\ReactiveAnimation.dll" target="lib\net45\ReactiveAnimation.dll" />
+        <file src="linqpad-samples\Reactive Animation Sample.linq" target="linqpad-samples\Reactive Animation Sample.linq" />
+        <file src="src\Animation.cs" target="src\Animation.cs" />
+        <file src="src\Easing.cs" target="src\Easing.cs" />
+        <file src="src\ObservableHelper.cs" target="src\ObservableHelper.cs" />
+    </files>
+</package>