Add DeleteService (#66)

Author: rolincova

README.md

@@ -361,6 +361,69 @@ public class FluxExample {
 }
 ```     
 
+### Delete data from InfluxDB 2.0
+
+The following example demonstrates how to delete data from InfluxDB 2.0.
+
+#### Installation
+
+Download the latest version:
+
+##### Maven dependency:
+
+```XML
+<dependency>
+    <groupId>com.influxdb</groupId>
+    <artifactId>influxdb-client-flux</artifactId>
+    <version>1.2.0</version>
+</dependency>
+```
+       
+##### Or when using Gradle:
+
+```groovy
+dependencies {
+    compile "com.influxdb:influxdb-client-flux:1.2.0"
+}
+``` 
+
+```java
+package example;
+
+import java.time.OffsetDateTime;
+import java.time.temporal.ChronoUnit;
+
+import com.influxdb.client.DeleteApi;
+import com.influxdb.client.InfluxDBClient;
+import com.influxdb.client.InfluxDBClientFactory;
+import com.influxdb.exceptions.InfluxException;
+
+public class DeleteData {
+
+    private static char[] token = "my-token".toCharArray();
+
+    public static void main(final String[] args) {
+
+        InfluxDBClient influxDBClient = InfluxDBClientFactory.create("http://localhost:9999", token);
+
+        DeleteApi deleteApi = influxDBClient.getDeleteApi();
+
+        try {
+
+            OffsetDateTime start = OffsetDateTime.now().minus(1, ChronoUnit.HOURS);
+            OffsetDateTime stop = OffsetDateTime.now();
+
+            deleteApi.delete(start, stop, "", "my-bucket", "my-org");
+
+        } catch (InfluxException ie) {
+            System.out.println("InfluxException: " + ie);
+        }
+
+        influxDBClient.close();
+    }
+}
+```
+
 ## Build Requirements
 
 * Java 1.8+ (tested with jdk8)