create project with libft and basic thread program

README.md

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+options :
+```
+- n_phi -> number_of_philosophers
+- t_die -> time_to_die
+- t_eat -> time_to_eat
+- t_slp -> time_to_sleep
+- n_est -> [number_of_times_each_philosopher_must_eat]
+```
+
+thread :
+- thread are light-weight-process (LWP) that happens inside a process
+- a process can be single-threaded or multi-threaded
+- different process have a unique PID with a unique LWP, different thread in the same process have the same PID and a different LWP
+- thread vs process :
+  process :
+  - process is isolated, it doesn't share memory with any other process
+  - process can have states : new, ready, running, waiting, terminated, suspended
+  - process is less efficient in communication, it takes more times to create or terminate or switch
+  - process speed is not impacted by speed of other process (untill it reach the limit of cpu)
+  - process are created with fork() and execve() (to duplicate a process in a child process, or replacing an existing process)
+  thread :
+  - thread are not isolated
+  - thread can have states : running, ready, blocked
+  - thread is more efficient in communication, it takes less times to create or terminate or switch
+  - thread can become slow if the process does many concurrent tasks
+- ressources :
+  - https://www.baeldung.com/linux/process-vs-thread
+
+
+external function :
+
+memset : fill memory with a constant byte
+printf : format and print data
+malloc : allocate dynamic memory
+free : free dynamic memory
+write : write to a file descriptor
+usleep : suspend execution for microseconds intervals
+gettimeofday : get time
+pthread_create : create a new thread
+pthread_detach : 
+pthread_join
+pthread_mutex_init
+pthread_mutex_destroy
+pthread_mutex_lock
+pthread_mutex_unlock
+