Add java example into the examples project

Author: pomadchin

examples/pdal-jni/README.md

@@ -1,4 +1,4 @@
 # PDAL JNI usage example
 
 To run this demo just launch `./sbt run` command and choose `1` 
-to run a basic `pdal-core` example, choose `2` to run as basic `pdal-scala` example.
+to run a basic `pdal-core` example, choose `2` to run a basic `pdal-core` example in Java, and choose `3` to run as basic `pdal-scala` example.

examples/pdal-jni/src/main/java/com/azavea/MainJava.java

@@ -0,0 +1,19 @@
+package com.azavea;
+
+import io.pdal.LogLevel;
+import io.pdal.Pipeline;
+
+class MainJava {
+  // to check laz "filename":"data/autzen_trim.laz"
+  static String json = "{\"pipeline\":[{\"filename\":\"data/1.2-with-color.las\",\"spatialreference\":\"EPSG:2993\"},{\"type\":\"filters.reprojection\",\"out_srs\":\"EPSG:3857\"}]}";
+
+  public static void main(String[] args) {
+    // can be replaced via io.pdal.Pipeline$.MODULE$.apply(json, LogLevel.Error());
+    // which incapsulates initialize() call
+    var pipeline = new Pipeline(json, LogLevel.Error());
+    pipeline.initialize();
+    pipeline.execute();
+    System.out.println("pipeline.getMetadata():" + pipeline.getMetadata());
+    pipeline.close();
+  }
+}