Update README.md

libft/README.md

@@ -1,3 +1,24 @@
 # libft
 
-personal C library
+C library
+
+### libc
+
+malloc interface functions, string manipulation
+
+### data structures
+
+- string (`char *`)
+- string array manipulation (`char **`)
+- linked list (`t_list`)
+- double linked list (`t_dlist`)
+- binary trees (`t_btree`)
+- time struct (`t_mytime`)
+
+### ft_printf
+
+printf rewrite
+
+### get_next_line
+
+read one line from a file descriptor, supports calls between multiple file descriptors.