chore: import upstream snapshot with attribution

docs/snippets/all/tutorials/getting_started_log.cpp

@@ -0,0 +1,16 @@
+#include <rerun.hpp>
+
+#include <cmath>
+
+int main(int argc, char* argv[]) {
+    const auto rec =
+        rerun::RecordingStream("rerun_example_getting_started", "run-1");
+    rec.save("run-1.rrd").exit_on_failure();
+
+    for (int t = 0; t < 10; ++t) {
+        rec.set_time_sequence("step", t);
+        const auto tf = static_cast<double>(t);
+        rec.log("/arm/shoulder", rerun::Scalars(std::sin(tf * 0.5)));
+        rec.log("/arm/elbow", rerun::Scalars(std::cos(tf * 0.5)));
+    }
+}