#1317 Special Case Pattern (#1624)

* #1317 Add Special Case Pattern

To focus on pattern itself, I implement DB and
maintenance lock by the singleton instance.

* #1317 Add special cases unit tests

Assert the logger output
(ref: https://stackoverflow.com/a/52229629)

* #1317 Add README.md

Add Special Case Pattern README

* #1317 Format: add a new line to end of file

Co-authored-by: Subhrodip Mohanta <subhrodipmohanta@gmail.com>

special-case/src/main/java/com/iluwatar/specialcase/DownForMaintenance.java

@@ -0,0 +1,14 @@
+package com.iluwatar.specialcase;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class DownForMaintenance implements ReceiptViewModel {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(DownForMaintenance.class);
+
+  @Override
+  public void show() {
+    LOGGER.info("Down for maintenance");
+  }
+}