Simple shell 1.0.9 history

[edward0rtiz]

• [x] Implement the history built-in, without any argument

• [x] The history built-in displays the history list, one command by line, preceded with line numbers (starting at 0)

• [ ] On exit, write the entire history, without line numbers, to a file named .simple_shell_history in the directory $HOME

• [ ] When the shell starts, read the file .simple_shell_history in the directory $HOME if it exists, and set the first line number to the total number of lines in the file modulo 4096