Added missing samples for UserCredentials in appendToStream

docs/clients/grpc/appending-events/README.md

@@ -109,4 +109,15 @@ This check can be used to implement optimistic concurrency. When you retrieve a
 TODO
 
 ## User credentials
-The credentials used to append the data can be supplied. Please see [here](/authentication/authenticating-with-username-password.html) for more information.
+You can provide user credentials to be used to append the data as follows. This will override the default credentials set on the connection.
+
+<xode-group>
+<xode-block title="C#">
+
+<<< @/samples/grpc/dotnet/GrpcDocs/Producer.cs#overriding-user-credentials
+</xode-block>
+<xode-block title="NodeJS">
+
+<<< @/samples/grpc/nodejs/samples/appending-events/index.js#overriding-user-credentials
+</xode-block>
+</xode-group>

samples/grpc/dotnet/GrpcDocs/Producer.cs

@@ -40,6 +40,16 @@ protected async Task ExecuteAsync(CancellationToken cancellationToken)
                 cancellationToken: cancellationToken
             );
             #endregion appendEvents
+
+            #region overriding-user-credentials
+            await client.AppendToStreamAsync(
+                "some-stream",
+                StreamState.Any,
+                new[] { eventData },
+                userCredentials: new UserCredentials("admin", "changeit"),
+                cancellationToken: cancellationToken
+            );
+            #endregion overriding-user-credentials
         }
     }
 }

samples/grpc/nodejs/samples/appending-events/index.js

@@ -113,3 +113,23 @@ export async function appendWithConcurrencyCheck(client) {
   });
   // endregion append-with-concurrency-check
 }
+
+export async function appendWithNoStreamOverridingCredentials(client) {  
+  const event = jsonEvent({
+    id: uuid(),
+    eventType: "some-event",
+    payload: {
+      id: "1",
+      value: "some value",
+    },
+  });
+  // region overriding-user-credentials
+  const credentials = {
+    username: "admin",
+    password: "changeit",
+  };
+  await client.appendToStream("some-stream", event, {
+    credentials
+  });
+  // endregion overriding-user-credentials
+}