add COPYING, README, and Emacs' dir-locals file

README.org

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+* brlib - A small personal C library
+** License
+SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+
+This work is, with exceptions below, Copyright (C) 2021-2024 Bruno Raoult
+("br"), and licensed under the GNU General Public License v3.0 or later.
+Some rights reserved. See COPYING.
+
+*** The licence exceptions are:
+**** Cutest testing framework.
+You can find the original work on
+[[https://sourceforge.net/projects/cutest/files/cutest/][sourceforge]].
+
+This software is (C) 2000-2003 Asim Jalis, under the zlib License.
+See [[test/cutest/license.txt][license local copy]] or
+<https://spdx.org/licenses/Zlib.html>.
+
+** Installation:
+*** clone repository
+**** user...
+#+BEGIN_EXAMPLE
+$ git clone https://git.raoult.com:bruno/brlib.git
+#+END_EXAMPLE
+or
+#+BEGIN_EXAMPLE
+$ git clone https://github.com/braoult/brlib.git
+#+END_EXAMPLE
+
+**** ... or developer
+#+BEGIN_EXAMPLE
+$ git clone git@git.raoult.com:bruno/brlib.git
+$ cd brlib
+$ git remote add github git@github.com:braoult/brlib.git
+#+END_EXAMPLE