Added publish script for nuget

SpotifyAPI/SpotifyAPI.nuspec

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+    <metadata>
+        <id>SpotifyAPI-NET</id>
+        <version>1.0.0</version>
+        <title>SpotifyAPI-NET</title>
+        <authors>JohnnyCrazy</authors>
+        <owners>JohnnyCrazy</owners>
+        <licenseUrl>https://github.com/JohnnyCrazy/SpotifyAPI-NET/blob/master/LICENSE</licenseUrl>
+        <projectUrl>https://github.com/JohnnyCrazy/SpotifyAPI-NET/</projectUrl>
+        <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <description>An API for the Spotify-Client and Spotify's Web API, written in .NET
+
+For more infos, visit https://github.com/JohnnyCrazy/SpotifyAPI-NET</description>
+        <language />
+        <tags>spotify api music .net c# spotify-client</tags>
+        <dependencies>
+            <dependency id="Newtonsoft.Json" version="8.0.2" />
+        </dependencies>
+    </metadata>
+    <files>
+        <file src="bin\Release\SpotifyAPI.dll" target="lib\SpotifyAPI.dll" />
+        <file src="bin\Release\SpotifyAPI.XML" target="lib\SpotifyAPI.XML" />
+    </files>
+</package>

SpotifyAPI/publish.cmd

@@ -0,0 +1,11 @@
+if "%APPVEYOR_REPO_TAG %" == "true" (
+echo Publishing...
+
+cd ./SpotifyAPI
+
+nuget pack -Version %APPVEYOR_REPO_TAG_NAME%
+
+cd ../
+) else (
+  echo Skipping Publishing
+)