Example and README added

README.md

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+Usage of list shown in "test.c"

test.c

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+// Usage of list
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "../libs/llist.h"
+
+typedef struct{
+	int a;
+	double b;
+} st;
+
+int main(){
+	
+	st s1 = {.a = 1, .b = 2.0};
+	double c = 3.0;
+	node *n1 = Node(&s1, sizeof s1);
+	llist l = Llist("lista", NULL);
+	
+	insert(&l, n1);
+	//l.head = n1;
+	printf("%d\n%f\n", ((st*)l.head->data)->a, s1.b);
+
+	return 0;
+	
+}