Attempt at adding the README to the NuGet package (#7807)

* Attempt at adding README to NuGet package

* Forgot to enable publishing

scripts/mk_nuget_task.py

@@ -103,7 +103,7 @@ def mk_targets(source_root):
 def mk_icon(source_root):
     mk_dir("out/content")
     shutil.copy(f"{source_root}/resources/icon.jpg", "out/content/icon.jpg")
-#   shutil.copy(f"{source_root}/src/api/dotnet/README.md", "out/content/README.md")
+    shutil.copy(f"{source_root}/src/api/dotnet/README.md", "out/content/README.md")
 
 
     
@@ -124,6 +124,7 @@ Linux Dependencies:
         <copyright>&#169; Microsoft Corporation. All rights reserved.</copyright>
         <tags>smt constraint solver theorem prover</tags>
         <icon>content/icon.jpg</icon>
+        <readme>content/README.md</readme>
         <projectUrl>https://github.com/Z3Prover/z3</projectUrl>
         <license type="expression">MIT</license>
         <repository type="git" url="{1}" branch="{2}" commit="{3}" />

scripts/release.yml

@@ -261,9 +261,9 @@ stages:
         artifact: 'MacArm64'
         path: $(Agent.TempDirectory)\package
 
-    - task: NuGetToolInstaller@0
+    - task: NuGetToolInstaller@1
       inputs:
-        versionSpec: 5.x
+        versionSpec: 6.x
         checkLatest: false        
     - task: PythonScript@0
       displayName: 'Python: assemble files'
@@ -305,9 +305,9 @@ stages:
       inputs:
         artifact: 'WindowsBuild-x86'
         path: $(Agent.TempDirectory)\package
-    - task: NuGetToolInstaller@0
+    - task: NuGetToolInstaller@1
       inputs:
-        versionSpec: 5.x
+        versionSpec: 6.x
         checkLatest: false        
     - task: PythonScript@0
       displayName: 'Python: assemble files'
@@ -471,7 +471,7 @@ stages:
 
      
   - job: NuGetPublish
-    condition: eq(1,0)
+    condition: eq(1,1)
     displayName: "Publish to NuGet.org"
     steps:
     - task: DownloadPipelineArtifact@2
@@ -479,9 +479,9 @@ stages:
       inputs:
         artifact: 'NuGetPackage'
         path: $(Agent.TempDirectory)
-    - task: NuGetToolInstaller@0
+    - task: NuGetToolInstaller@1
       inputs:
-        versionSpec: 5.x
+        versionSpec: 6.x
         checkLatest: false
     - task: NuGetCommand@2
       inputs: