chore: import upstream snapshot with attribution

docs/snippets/all/quick_start/quick_start_spawn.cpp

@@ -0,0 +1,22 @@
+#include <rerun.hpp>
+#include <rerun/demo_utils.hpp>
+
+using namespace rerun::demo;
+
+int main(int argc, char* argv[]) {
+    // Create a new `RecordingStream` which sends data over gRPC to the viewer process.
+    const auto rec = rerun::RecordingStream("rerun_example_quick_start_spawn");
+    rec.spawn().exit_on_failure();
+
+    // Create some data using the `grid` utility function.
+    std::vector<rerun::Position3D> points =
+        grid3d<rerun::Position3D, float>(-10.f, 10.f, 10);
+    std::vector<rerun::Color> colors =
+        grid3d<rerun::Color, uint8_t>(0, 255, 10);
+
+    // Log the "my_points" entity with our data, using the `Points3D` archetype.
+    rec.log(
+        "my_points",
+        rerun::Points3D(points).with_colors(colors).with_radii({0.5f})
+    );
+}