updated to new nuget standards, and updated to net5.0

Contentless/Contentless.nuspec

@@ -2,18 +2,24 @@
 <package>
     <metadata>
         <id>Contentless</id>
-        <version>3.0.5</version>
         <authors>Ellpeck</authors>
         <description>A tool for MonoGame that automatically handles adding assets to the Content Pipeline project</description>
         <tags>monogame mono xna content pipeline mgcb builder tool library</tags>
         <projectUrl>https://github.com/Ellpeck/Contentless</projectUrl>
-        <licenseUrl>https://github.com/Ellpeck/Contentless/blob/master/LICENSE</licenseUrl>
+        <license type="expression">MIT</license>
         <repository type="git" url="https://github.com/Ellpeck/Contentless"/>
+        <readme>README.md</readme>
+        <icon>Logo.png</icon>
+        <version>3.0.5</version>
+        <dependencies>
+            <group targetFramework="net5.0" />
+        </dependencies>
     </metadata>
     <files>
-        <file src="../README.md" target="README.md"/>
-        <file src="_._" target="lib/netcoreapp3.1/"/>
+        <file src="_._" target="lib/net5.0/"/>
         <file src="Contentless.targets" target="build/Contentless.targets"/>
-        <file src="bin\Debug\netcoreapp3.1\**\*" target="tools/"/>
+        <file src="bin\Debug\net5.0\**\*" target="tools/"/>
+        <file src="../README.md" target="" />
+        <file src="../Logo.png" target="" />
     </files>
 </package>

README.md

@@ -1,5 +1,6 @@
-# Contentless
-A tool for MonoGame that automatically handles adding assets to the Content Pipeline project so you don't have to use their interface to add every content file manually.
+![The Contentless logo](https://raw.githubusercontent.com/Ellpeck/Contentless/master/Logo.png)
+
+**Contentless** is tool for MonoGame that automatically handles adding assets to the Content Pipeline project so you don't have to use their interface to add every content file manually.
 
 # How to use
 To use Contentless, you first have to add it to your project, either through your NuGet package manager or by adding it to your `.csproj` file as follows. Keep in mind to update the `Version` to the most recent one. You can find the package on the [NuGet website](https://www.nuget.org/packages/Contentless/) as well.

Test/Test.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>netcoreapp3.1</TargetFramework>
+        <TargetFramework>net5.0</TargetFramework>
     </PropertyGroup>
 
     <ItemGroup>