add example on how to include KissICP C++ lib in other projects

cpp/include_example/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.18.0)
+project(kiss_icp_include_example)
+
+find_package(kiss_icp REQUIRED CONFIG)
+
+add_executable(example src/example.cpp)
+target_link_libraries(example PRIVATE kiss_icp::kiss_icp_pipeline)
+#for other components (not used in example.cpp):
+#target_link_libraries(example PRIVATE kiss_icp::kiss_icp_core)
+#target_link_libraries(example PRIVATE kiss_icp::kiss_icp_metrics)
+

cpp/include_example/README.md

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+# Example on how to include the KissICP library in other C++ projects with CMake
+
+See `CMakeLists.txt` for details on how to find the library and link the targets, and `src/example.cpp` on how to include the corresponding files.
+
+## Building your project
+```bash
+cmake -Bbuild
+cmake --build build -j$(nproc --all)
+```
+

cpp/include_example/src/example.cpp

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+#include <kiss_icp/pipeline/KissICP.hpp>
+
+int main(){
+    struct kiss_icp::pipeline::KISSConfig config;
+    config.deskew = true;
+    config.initial_threshold = 2.0;
+    config.min_range = 8.0;
+    config.max_range = 100.0;
+    config.max_points_per_voxel = 20;
+    config.min_motion_th = 0.1;
+    config.voxel_size = 1.0;
+    kiss_icp::pipeline::KissICP icp_pipeline{config};
+    // TODO: use pipeline here
+
+}