Init test case

tcr-roman-numerals/src/test/java/fr/ippon/kata/numeral/NumeralsTest.java

+package fr.ippon.kata.numeral;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class NumeralsTest {
+
+  @Test
+  void shouldConvertZeroToEmptyString() {}
+}