doc: Update README

README.md

@@ -1,11 +1,12 @@
 # 42sh - A POSIX shell with a bad name
 
-42sh is a shcool project aiming to implement a POSIX compliant shell in C.
+42sh is a project aiming to implement a POSIX-compliant shell written in C with only the standard library.
+Source de is fully documented with the doxygen format so you can easily understand how the project works by exploring it. 
+
+> **Note** This is a school project, therefore it probably won't interest you if you are looking for something useful.
 
 ## Getting started
 
-TODO
-
 ### Build
 run this command:
     `autoreconf --force --verbose --install`
@@ -16,27 +17,43 @@ run this command:
 then:
     `make`
 
-#### asan
+#### Build with ASan
 run this command:
     `./configure CFLAGS='-std=c99 -Werror -Wall -Wextra -Wvla -g -fsanitize=address'`
+
 or for MacOS (Jean Here):
     `./configure CFLAGS='-std=c99 -Werror -Wall -Wextra -Wvla -I/opt/homebrew/include' LDFLAGS='-L/opt/homebrew/lib'`
     
 then:
     `make check`
 
+## Project status
+
+### Implemented features
+
+* **Command Execution:** `$PATH` search and binary execution (via `fork` and `execvp`) with error return code handling.
+* **Built-ins:** Native implementation of `echo`, `cd`, `exit`, `export`, `unset`, `set`, `.`, `true`, `false`, as well as loop management with `break` and `continue`.
+* **Control Structures:** * Conditions: `if / then / elif / else / fi`.
+    * Loops: `while`, `until` and `for`.
+* **Logical Operators:** Command chaining with `&&`, `||` and negation with `!`.
+* **Pipelines and Redirections:** * Full management of pipes `|` to connect the output of one process to the input of another.
+    * Single and multiple redirections: `>`, `<`, `>>`, `>&`, `<&`, `<>`.
+* **Variables Management:** Assignment, variable expansion, and special variables handling like `$?` (return code of the last command).
+* **Command Grouping:** Execution blocks `{ ... }` and subshells creation `( ... )`.
+* **Quoting:** Support for weak (`"`) and strong (`'`) quoting for special characters escaping.
+
+## Architecture
+
+The shell operates on a classic compilation/interpretation pipeline:
+
+1. **Lexer (Lexical Analysis):** Reads standard input (or script) character by character and generates a stream of "Tokens" (Words, Operators, Redirections).
+2. **Parser (Syntax Analysis):** Syntax analyzer that transforms the token stream into a complex Abstract Syntax Tree (AST). This module strictly manages the nesting of control structures and enforces the rigid grammar of the Shell Command Language.
+3. **Execution (AST Traversal):** The tree is traversed recursively. Redirections modify file descriptors (`dup2`), child processes are created (`fork`), and commands are executed.
+
+
 ## Authors
 
+- Guillem George
 - Matteo Flebus
 - Jean Herail
 - William Valenduc
-- Guillem George
-
-## Project status
-
-WIP
-
-## TODO
-
-# Autotools
-implement functions in all .c files to see if everything compiles.