Added config & completed workflow

sign.json

@@ -0,0 +1,13 @@
+{
+  "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"
+    }
+  }
+}