Update azure-pipelines.yml

Include missing: CHANGELOG.md, LICENSE.md, assets, nuspec file.

config/SignClient.json

@@ -0,0 +1,14 @@
+{
+    "SignClient": {
+      "AzureAd": {
+        "AADInstance": "https://login.microsoftonline.com/",
+        "ClientId": "c248d68a-ba6f-4aa9-8a68-71fe872063f8",
+        "TenantId": "16076fdc-fcc1-4a15-b1ca-32c9a255900e"
+      },
+      "Service": {
+        "Url": "https://codesign.dotnetfoundation.org/",
+        "ResourceId": "https://SignService/3c30251f-36f3-490b-a955-520addb85001"
+      }
+    }
+  }
+  

config/filelist.txt

@@ -0,0 +1 @@
+**/nanoFramework.Json.*