try to put readme in root

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

scripts/mk_nuget_task.py

@@ -24,10 +24,11 @@ def mk_dir(d):
 os_info = {  'ubuntu-latest' : ('so', 'linux-x64'),
              'ubuntu-18' : ('so', 'linux-x64'),
              'ubuntu-20' : ('so', 'linux-x64'),
-             'x64-glibc-2.31' : ('so', 'linux-x64'),
+             'x64-glibc-2.35' : ('so', 'linux-x64'),
              'x64-win' : ('dll', 'win-x64'),
              'x86-win' : ('dll', 'win-x86'),
              'x64-osx' : ('dylib', 'osx-x64'),
+             'arm-glibc-2.35' : ('so', 'linux-arm64'),
              'arm64-osx' : ('dylib', 'osx-arm64'),
              'debian' : ('so', 'linux-x64') }
 
@@ -88,7 +89,7 @@ def mk_icon(source_root):
 
 def mk_readme(source_root):
     mk_dir("out/content")
-    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/README.md")
 
 
 
@@ -109,7 +110,7 @@ def create_nuget_spec(version, repo, branch, commit, symbols, arch):
         <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>
+        <readme>README.md</readme>
         <projectUrl>https://github.com/Z3Prover/z3</projectUrl>
         <license type="expression">MIT</license>
         <repository type="git" url="{1}" branch="{2}" commit="{3}" />