initial commit

src/main/resources/templates/fragments/footer.html

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+<footer th:fragment="footer" class="col-md-12 text-center">
+	<span class="col-md-12"> <a class="btn btn-primary"
+		th:href="@{/}">Volver</a>
+	</span><br />
+	<span>&copy;2021</span>
+</footer>