Modify .gitignore to ignore *.bak files

Signed-off-by: Yitao Zhang <xtayyt@gmail.com>
Add master and slaver empty project files

Signed-off-by: Yitao Zhang <xtayyt@gmail.com>
Modify the .gitignore file to ignore the binary files generated by
complier and linker

Signed-off-by: Yitao Zhang <xtayyt@gmail.com>