Add vcpkg.json for the QtProtobuf sensors example

Use the vcpkg manifest to configure and build QtProtobuf sensors
example. This allows automating the dependency installation using
vcpkg.

Pick-to: 6.9
Task-number: QTBUG-132738
Change-Id: Icae7acf46d97d834a064d7663623757a7ec35742
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

examples/protobuf/sensors/vcpkg.json

@@ -0,0 +1,18 @@
+{
+    "$schema": "https://raw.githubusercontent.com/microsoft/vcpkg-tool/main/docs/vcpkg.schema.json",
+    "description": "The Sensors example shows how two applications can communicate by sending protobuf messages using UDP sockets",
+    "dependencies": [
+        "protobuf"
+    ],
+    "features": {
+        "vcpkg-qt": {
+            "description": "Use Qt libraries from vcpkg",
+            "dependencies": [
+                {
+                    "name": "qtgrpc",
+                    "version>=": "6.9"
+                }
+            ]
+        }
+    }
+}