Provide a quick offline build guide in README.md

README.md

@@ -11,7 +11,7 @@ A lightweight text editor written in Lua, adapted from [lite].
 * **[Get color themes]** — Add additional colors themes.
 
 Please refer to our [website] for the user and developer documentation,
-including [build] instructions.
+including [build] instructions details. A quick build guide is described below.
 
 Lite XL has support for high DPI display on Windows and Linux and,
 since 1.16.7 release, it supports **retina displays** on macOS.
@@ -42,6 +42,32 @@ the [plugins repository] or in the [Lite XL plugins repository].
 Additional color themes can be found in the [colors repository].
 These color themes are bundled with all releases of Lite XL by default.
 
+## Quick Build Guide
+
+If you compile Lite XL yourself, it is recommended to use the script
+`build-packages.sh`:
+
+```sh
+bash build-packages.sh <arch>
+```
+
+The script will run Meson and create a zip file with the application or,
+for Linux, a tar compressed archive. Lite XL can be easily installed
+by unpacking the archive in any directory of your choice.
+
+Otherwise the following is an example of basic commands if you want to customize
+the build:
+
+```sh
+meson setup --buildtype=release --prefix <prefix> build
+meson compile -C build
+DESTDIR="$(pwd)/lite-xl" meson install --skip-subprojects -C build
+```
+
+where `<prefix>` might be one of `/`, `/usr` or `/opt`, the default is `/usr/local`.
+Please note that the package is relocatable to any prefix and the option prefix
+affects only the place where the application is actually installed.
+
 ## Contributing
 
 Any additional functionality that can be added through a plugin should be done