Update README

Close #8467

README

@@ -29,6 +29,7 @@ Source Code Content:
 ABOUT-NLS          - Notes on the Free Translation Project.
 AUTHORS            - VLC authors.
 COPYING            - The GPL license.
+COPYING.LIB        - The LGPL license.
 INSTALL            - Installation and building instructions.
 NEWS               - Important modifications between the releases.
 README             - This file.
@@ -37,14 +38,16 @@ THANKS             - VLC contributors.
 bin/               - VLC binaries.
 bindings/          - libVLC bindings to other languages.
 compat/            - compatibility library for operating systems missing
-                     essential functionnalities.
-contrib/           - external libraries retrieving facilities for systems that
-                     don't have package manager.
+                     essential functionalities.
+contrib/           - Facilities for retrieving external libraries and building
+                     them for systems that don't have the right versions.
 doc/               - Miscellaneous documentation.
 extras/analyser    - Code analyser and editor specific files.
 extras/buildsystem - different buildsystems specific files.
 extras/misc        - Files that don't fit in the other extras/ categories.
 extras/package     - VLC packaging specific files such as spec files.
+extras/tools/      - Facilities for retrieving external building tools needed
+                     for systems that don't have the right versions.
 include/           - Header files.
 lib/               - libVLC source code.
 modules/           - VLC plugins and modules. Most of the code is here.