Add ConversationAdapterV2.

.idea/fileTemplates/internal/Class.java

@@ -0,0 +1,9 @@
+/*
+ * Copyright ${YEAR} Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME};#end
+#parse("File Header.java")
+public class ${NAME} {
+}