Update Installation/README

Installation/README.md

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+README
+======
+
+This distribution of CGAL includes:
+
+- `AUTHORS`: current and former authors of CGAL
+- `CHANGES.md`: history of changes of CGAL
+- `CGALConfig.cmake`:
+- `CGALConfigVersion.cmake`:
+- `CMakeLists.txt`: main CMake project configuration file
+- `INSTALL.md`: information about the installation process
+- `LICENSE`: describes the license of CGAL
+- `LICENSE.BSL`: text of the Boost Software License (BSL) license
+- `LICENSE.COMMERCIAL`: text of the GeometryFactory Commercial license
+- `LICENSE.GPL`: text of the GNU General Public License (GPL) v3 license
+- `LICENSE.LGPL`: text of the GNU LESSER GENERAL PUBLIC License (LGPL) v3 license
+- `LICENSE.RFL`: text of the ETH Zurich Random Forest algorithm License (RFL) license
+- `README.md`: this file
+- `VERSION`: version number of this release of CGAL
+- `auxiliary/`: directory containing miscellaneous things, such as icons needed for the demos on macOS
+- `cmake/`: some scripts needed by the CMake build system
+- `data/`: directory containing various geometric data used by examples and demos of CGAL
+- `demo/`: many demo programs for the various packages of CGAL. These programs produce visual output.
+- `doc_html/`: documentation, e.g. the CGAL Installation Guide
+- `examples/`: programs illustrating the various packages of CGAL. These programs do not produce visual output.
+- `include/`: the include files for the CGAL library (as well as small external libraries, see the file `LICENSE`)
+- `lib/`:
+- `scripts/`: some useful scripts for CGAL programmers
+