add logger class (#29)

* add logger class

* add LOCATION macro for logger

* added printing in files

utils/src/logger.cpp

@@ -0,0 +1,14 @@
+#include "aare/utils/logger.hpp"
+
+namespace aare {
+namespace logger {
+namespace internal {
+aare::logger::Logger logger_instance = aare::logger::Logger();
+} // namespace internal
+void set_streams(std::streambuf *out, std::streambuf *err) { internal::logger_instance.set_streams(out, err); }
+void set_streams(std::streambuf *out) { internal::logger_instance.set_streams(out); }
+void set_verbosity(LOGGING_LEVEL level) { internal::logger_instance.set_verbosity(level); }
+Logger &get_logger_instance() { return internal::logger_instance; }
+void set_output_file(std::string filename){ internal::logger_instance.set_output_file(filename); }
+} // namespace logger
+} // namespace aare