added logging module and a sandbox project

source/core/logger/basic_file_sink.cpp

@@ -0,0 +1,23 @@
+#include "matador/logger/basic_file_sink.hpp"
+
+namespace matador::logger {
+
+basic_file_sink::basic_file_sink(FILE *f)
+: stream(f)
+{}
+
+void basic_file_sink::write(const char *message, const size_t size)
+{
+  fwrite(message, sizeof(char), size, stream);
+  fflush(stream);
+}
+
+void basic_file_sink::close()
+{
+  if (stream) {
+    fclose(stream);
+    stream = nullptr;
+  }
+}
+
+}