Project update

Now I created my makefile to build the project with some optimizations compiler flags! I also updated README.md and created a function to delete the history commands.

Hello everyone! After a long time, I finally started programming again! Today I wanted to try to create a shell because… why not? So I present to you lightshell, my own unix shell written in C++. The size of the compiled source is WAY LESS than 1MB and I’m working hard to understand all the C++ libraries that I need. Let me know if you’d like some new features!