New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/base/gmtime.cpp

@@ -0,0 +1,17 @@
+#include "base/gmtime.hpp"
+
+#include "std/target_os.hpp"
+
+namespace base
+{
+std::tm GmTime(time_t time)
+{
+  std::tm result{};
+#ifndef OMIM_OS_WINDOWS
+  gmtime_r(&time, &result);
+#else
+  gmtime_s(&result, &time);
+#endif
+  return result;
+}
+}  // namespace base