Merge pull request 'add README and copyright clarification' (#1) from lw-everestlinux/add_README into main

Reviewed-on: #1

README

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++-----+
+| esm |
++-----+
+
+Esm is a bootscript manager for Linux. It interfaces with SysVinit-style bootscripts.
+
++--------------+
+| Installation |
++--------------+
+
+Esm requires the following libraries to compile:
+
+	* libconfig
+
+Libconfig is provided as a submodule of esm's source tree.
+Clone and enter the repository:
+
+	$ git clone https://git.everestlinux.org/EverestLinux/esm
+	$ cd esm
+
+If you wish to compile the provided libconfig, follow the steps below:
+
+	Update the submodule:
+		$ git submodule update --init --recursive
+
+	Change directory into libconfig:
+		$ cd src/libconfig
+
+	Generate the necessary build files:
+		$ autoreconf
+
+	Run the configure script and compile the library:
+		$ ./configure && make
+	
+	(OPTIONAL) Run the test suite:
+		$ make check
+
+	Install the library:
+		# make install
+
+Otherwise, compile the esm binary:
+
+	$ make
+
+Install esm:
+
+	# make install
+
++-----------+
+| COPYRIGHT |
++-----------+
+
+Esm uses the following third-party libraries:
+* Libcobnfig - Licensed under the LGPL v2.1.
+	The source code for libconfig is available at: <https://github.com/hyperrealm/libconfig>
+	The full text for the LGPOL v2.1 is available at: <https://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt>
+
+(C) 2025 Everest Developers
+This program is free software: you can redistribute it and/or modify it 
+under the terms of the GNU General Public License as published by the
+Free Software Foundation, either version 3 of the License, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+See the GNU General Public License for more details.
+You should have received a copy of the GNU General Public License along with
+this program.
+If not, see <https://www.gnu.org/licenses/>.