addition: Base for implementation

src/graph.c

@@ -1 +1,22 @@
 #include "graph.h"
+#include "arraylist.h"
+#include <inttypes.h>
+#include <stdint.h>
+
+struct Vertex {
+    void *data;
+    ArrayList *edges;
+};
+
+struct Edge {
+    size_t *to;
+    intmax_t weight;
+};
+
+struct Graph {
+    ArrayList *vertices;
+    GraphType type;
+    
+    int (*cmp)(const void*, const void*);
+    void (*free_data)(void*);
+};

src/main.c

@@ -1,5 +1,4 @@
 #include <stdlib.h>
-#include <stdio.h>
 
 int main(void) {
     return EXIT_SUCCESS;