chore: import upstream snapshot with attribution

data/CMakeLists.txt

@@ -0,0 +1,9 @@
+file(GLOB HAAR_CASCADES haarcascades/*.xml)
+file(GLOB LBP_CASCADES lbpcascades/*.xml)
+
+install(FILES ${HAAR_CASCADES} DESTINATION ${OPENCV_OTHER_INSTALL_PATH}/haarcascades COMPONENT libs)
+install(FILES ${LBP_CASCADES}  DESTINATION ${OPENCV_OTHER_INSTALL_PATH}/lbpcascades  COMPONENT libs)
+
+if(INSTALL_TESTS AND OPENCV_TEST_DATA_PATH)
+  install(DIRECTORY "${OPENCV_TEST_DATA_PATH}/" DESTINATION "${OPENCV_TEST_DATA_INSTALL_PATH}" COMPONENT "tests")
+endif()

data/readme.txt

@@ -0,0 +1,7 @@
+This folder contains various data that is used by cv libraries and/or demo applications.
+----------------------------------------------------------------------------------------
+
+haarcascades - the folder contains trained classifiers for detecting objects
+               of a particular type, e.g. faces (frontal, profile), pedestrians etc.
+               Some of the classifiers have a special license - please,
+               look into the files for details.