Added Example

Added example.c file with usage example, also added imports to list.h
 example.c: A simple example on how to use the header
 list.h: Added imports that I forgot to add before

example.c

@@ -0,0 +1,24 @@
+#include<stdio.h>
+#include "list.h"
+
+STRUCT_LIST(int, ListInt)
+
+int main(int argc, char* argv){
+	ListInt* list = ListInt_new();
+
+	int next = 1;
+	//loop until user enters 0 or something that isn't a number
+	printf("Enter numbers(0 to finish): ");
+	while (next) {
+		if (scanf(" %d", &next) != 1) break;
+		ListInt_add(list, next);
+	}
+
+	printf("List: ");
+	for (int i = 0; i < ListInt_size(list); i++){
+		printf("%d ", ListInt_get(list, i));
+	}
+	printf("\n");
+
+	return 0;
+}

list.h

@@ -1,6 +1,10 @@
 #ifndef __LIST_H__
 #define __LIST_H__
 
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+
 #define DEFAULT_SIZE 8
 
 #define STRUCT_LIST(type, List_name)																\