Add structure of the binary tree used for huffman, along with stdio and string headers

huffman.h

@@ -0,0 +1,16 @@
+#ifndef _GLOBAL_HUFFMAN_H
+#define _GLOBAL_HUFFMAN_H 1
+
+// On inclus nos dépendances que tous le programme utilisera
+#include <stdio.h>
+#include <string.h>
+
+// Structure du noeud
+typedef struct noeud_huffman {
+    char lettre;
+    int frequence;
+    struct noeud_huffman *gauche;
+    struct noeud_huffman *droite;
+} *Noeud;
+
+#endif // <huffman.h> inclus