Add mingw build and run script for bench example

bench/Makefile.mingw

+CXX	= g++
+CXXFLAGS	= -D_WIN32_WINNT=0x600 -march=native -Wall -Wextra -Wshadow -pedantic -std=c++11 -pthread -Wl,--no-as-needed  -I../include 
+CXX_RELEASE_FLAGS = -O3 -flto
+
+
+all:	spdlog-bench spdlog-bench-mt boost-bench boost-bench-mt
+
+spdlog-bench: spdlog-bench.cpp
+	$(CXX) spdlog-bench.cpp -o spdlog-bench $(CXXFLAGS) $(CXX_RELEASE_FLAGS)
+	
+spdlog-bench-mt: spdlog-bench-mt.cpp
+	$(CXX) spdlog-bench-mt.cpp -o spdlog-bench-mt  $(CXXFLAGS) $(CXX_RELEASE_FLAGS)	
+
+BOOST_FLAGS	= -DBOOST_LOG_DYN_LINK  -I$(BOOST_ROOT)/include -L$(BOOST_ROOT)/lib -lboost_log  -lboost_log_setup -lboost_filesystem -lboost_system -lboost_thread -lboost_regex -lboost_date_time -lboost_chrono	
+
+boost-bench: boost-bench.cpp
+	$(CXX) boost-bench.cpp -o boost-bench $(CXXFLAGS) $(BOOST_FLAGS) $(CXX_RELEASE_FLAGS)
+	
+boost-bench-mt: boost-bench-mt.cpp
+	$(CXX) boost-bench-mt.cpp -o boost-bench-mt $(CXXFLAGS) $(BOOST_FLAGS) $(CXX_RELEASE_FLAGS)	
+
+
+clean:
+	rm -f *.o logs/*.txt spdlog-bench spdlog-bench-mt boost-bench boost-bench-mt
+
+
+rebuild: clean all
+
+
+

bench/run_all.bat

+@echo off
+echo Running benchmarks (all with 1000,000 writes to the logs folder)
+echo ==================================
+echo boost-bench (single thread)
+echo %time%
+.\boost-bench
+echo %time%
+echo ==================================
+choice /n /c y /d y /t 1 >NUL
+echo spdlog-bench (single thread)
+echo %time%
+.\spdlog-bench
+echo %time%
+echo ==================================
+choice /n /c y /d y /t 1 >NUL
+echo boost-bench-mt (10 threads, single logger)
+echo %time%
+.\boost-bench-mt
+echo %time%
+echo ==================================
+choice /n /c y /d y /t 1 >NUL
+echo spdlog-bench-mt (10 threads, single logger)
+echo %time%
+.\spdlog-bench-mt
+echo %time%
+echo ==================================
+
+