First iteration of S3 run summary

scripts/s3_run_summary.cxx

+#include <iostream>
+#include <string>
+
+#include <ROOT/RDataFrame.hxx>
+
+#include <eicd/ReconstructedParticleData.h>
+
+int s3_run_summary(std::string name)
+{
+  // determine s3https url
+  auto slash = name.find_first_of("/");
+  if (slash == std::string::npos) {
+    std::cout << "Error: No slash in file name" << std::endl;
+    return -1;
+  }
+  std::string url("s3https://dtn01.sdcc.bnl.gov:9000/" + name.substr(slash+1));
+  std::cout << "Info: url = " << url << std::endl;
+
+  // open dataframe
+  ROOT::RDataFrame df("events", url, {"mcparticles2", "GeneratedParticles", "ReconstructedParticles"});
+  // count total events
+  auto count = df.Count();
+  if (count == 0) {
+    std::cout << "Error: No events found" << std::endl;
+    return -1;
+  }
+
+  // work on range only
+  auto d = df.Range(100)
+  // number of tracks
+  .Define("n_tracks", [](const std::vector<eic::ReconstructedParticleData> &p) { return (int) p.size(); }, {"ReconstructedParticles"});
+
+  auto stats_n_tracks = d.Stats("n_tracks");
+  if (stats_n_tracks->GetMean() < 1.0) {
+    std::cout << "Error: too few tracks per events " << std::endl;
+    stats_n_tracks->Print();
+    return -1;
+  }
+
+  // success
+  return 0;
+}