Add Geospatial data type example (#3487)

* Add Geospatial data type example

* Add missing REMOVE_END

src/test/java/io/redis/examples/GeoExample.java

@@ -0,0 +1,60 @@
+//EXAMPLE: geo_tutorial
+package io.redis.examples;
+
+// REMOVE_START
+import org.junit.Test;
+// REMOVE_END
+import redis.clients.jedis.GeoCoordinate;
+import redis.clients.jedis.UnifiedJedis;
+import redis.clients.jedis.args.GeoUnit;
+import redis.clients.jedis.resps.GeoRadiusResponse;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.junit.Assert.assertEquals;
+
+public class GeoExample {
+  @Test
+  public void run() {
+    try (UnifiedJedis jedis = new UnifiedJedis("redis://localhost:6379")) {
+      // REMOVE_START
+      jedis.del("bikes:rentable");
+      // REMOVE_END
+
+      // STEP_START geoadd
+      long res1 = jedis.geoadd("bikes:rentable", -122.27652, 37.805186, "station:1");
+      System.out.println(res1); // 1
+
+      long res2 = jedis.geoadd("bikes:rentable", -122.2674626, 37.8062344, "station:2");
+      System.out.println(res2); // 1
+
+      long res3 = jedis.geoadd("bikes:rentable", -122.2469854, 37.8104049, "station:3");
+      System.out.println(res2); // 1
+      // STEP_END
+
+      // REMOVE_START
+      assertEquals(1, res1);
+      assertEquals(1, res1);
+      assertEquals(1, res1);
+      // REMOVE_END
+
+      // STEP_START geosearch
+      List<GeoRadiusResponse> res4 = jedis.geosearch(
+          "bikes:rentable",
+          new GeoCoordinate(-122.27652, 37.805186),
+          5,
+          GeoUnit.KM
+      );
+      List<String> members = res4.stream() //
+          .map(GeoRadiusResponse::getMemberByString) //
+          .collect(Collectors.toList());
+      System.out.println(members); // [station:1, station:2, station:3]
+      // STEP_END
+
+      // REMOVE_START
+      assertEquals("[station:1, station:2, station:3]", members.toString());
+      // REMOVE_END
+    }
+  }
+}