Create and upload NuGet package

This reverts commit 109dd2caad2369f03df34e83b27d5b0c954cbfd8.

.github/workflows/build.yml

@@ -88,11 +88,24 @@ jobs:
           source: "raylib-osx64/raylib-${{steps.get-tag.outputs.info}}_macos/lib/libraylib.dylib"
           target: "Raylib-cs/runtimes/osx-x64/native/libraylib.dylib"
 
-      - name: output directory
+      - id: get-nuget-version
-        run: "ls -la ."
+        name: Get NuGet Package Version
+        uses: mavrosxristoforos/get-xml-info@1.0
+        with:
+          xml-file: "./Raylib-cs/Raylib-cs.csproj"
+          xpath: "//PackageVersion"
 
-      - name: 'Upload runtimes'
+      - name: Create NuGet Package
+        run:  dotnet pack -c Release
+
+      - name: Upload NuGet Package As Artifact
         uses: actions/upload-artifact@v2
         with:
-          name: runtimes
+          name: Raylib-cs.${{steps.get-nuget-version.outputs.info}}.nupkg
-          path: Raylib-cs/runtimes
+          path: Raylib-cs/bin/Release/Raylib-cs.${{steps.get-nuget-version.outputs.info}}.nupkg
+
+      - name: Upload NuGet Package As Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with: 
+          files: Raylib-cs/bin/Release/Raylib-cs.${{steps.get-nuget-version.outputs.info}}.nupkg