Add example external project to test osgEarthConfig.cmake

share/ExternalProject/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+project(ExternalExample)
+
+find_package(osgEarth CONFIG REQUIRED)
+
+add_executable(ExternalExample main.cpp)
+
+target_link_libraries(ExternalExample PRIVATE osgEarth)

share/ExternalProject/README.md

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+# External Project Example
+This is a simple example to test the `osgEarthConfig.cmake` packaging configuration file for CMake.
+
+These line in your `CMakeLists.txt` will tell CMake to look for `osgEarthConfig.cmake` and use it to resolve osgEarth and its public-facing dependencies:
+```
+find_package(osgEarth CONFIG REQUIRED)
+...
+target_link_libraries(my_project PRIVATE osgEarth)
+```
+You may need to update your `CMAKE_PREFIX_PATH` to include the location of `osgEarthConfig.cmake`.

share/ExternalProject/main.cpp

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+#include <osgEarth/MapNode>
+#include <osgEarth/TMS>
+#include <osgEarth/EarthManipulator>
+#include <osgViewer/Viewer>
+
+int main(int argc, char** argv)
+{
+    osg::ArgumentParser args(&argc, argv);
+    osgViewer::Viewer viewer(args);
+
+    osgEarth::initialize();
+    osgEarth::setNotifyLevel(osg::INFO);
+
+    auto layer = new osgEarth::TMSImageLayer();
+    layer->setURL("https://readymap.org/readymap/tiles/1.0.0/7/");
+
+    auto mapNode = new osgEarth::MapNode();
+    mapNode->getMap()->addLayer(layer);
+
+    viewer.setCameraManipulator(new osgEarth::Util::EarthManipulator());
+
+    viewer.setSceneData(mapNode);
+    return viewer.run();
+}