Move Roster Item Exchange code to legacy project

XEP-93 has been deprecated and superseded by XEP-144.

legacy/src/test/java/org/jivesoftware/smackx/LegacyProviderInitializerTest.java

@@ -0,0 +1,31 @@
+/**
+ *
+ * Copyright the original author or authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class LegacyProviderInitializerTest {
+
+    @Test
+    public void testWorkgroupProviderInitializer() {
+        LegacyProviderInitializer lpi = new LegacyProviderInitializer();
+        lpi.initialize();
+        assertTrue(lpi.getExceptions().size() == 0);
+    }
+}