Add readme

README.md

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+# FileQueue
+Store messages on a disk queue in a fast producer, slow consumer scenario.
+
+```java
+var tmpFile = Paths.get("temp.queue.bin");
+try (var queue = new it.cavallium.filequeue.DiskQueueToConsumer<String>(tmpFile, new Serializer<String>() {
+  @Override
+  public byte[] serialize(String data) throws IOException {
+    return data.getBytes(StandardCharsets.US_ASCII);
+  }
+}, new Deserializer<String>() {
+  @Override
+  public String deserialize(byte[] data) throws IOException {
+    return new String(data, StandardCharsets.US_ASCII);
+  }
+}, text -> {
+  System.out.println("Received: %s", text);
+  
+  // Return true if the message has been consumed, false to retry later
+  return true;
+})) {
+  queue.startQueue();
+    
+  final var text = "test-message";
+	
+  while (true) {
+    System.out.println("Emitted: %s", text);
+    queue.add(text);
+  }
+}
+```