Add more information into README.md

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-# Airport
+# Overview
+`Airport` is a free (as in freedom) video game for the original Sony
+Playstation aka PSX. The player puts himself/herself in the role of an Air
+Traffic Controller (ATC) where inbound and outbound flights must be brought to
+their destinations safely and within time.
 
-## Overview
+While aiming for an arcade experience, `Airport` is inspired by real-world
+procedures used in aviation so those used to realistic flight simulators might
+enjoy this video game as well. While many features are still missing, the game
+is in a rather playable state.
 
-### What is Airport?
+`Airport` is written in C using the `mipsel-unknown-elf` GNU toolchain and a
+free SDK called PSXSDK, created by nextvolume. Since the original author stopped
+developing it, a [custom version of the SDK](https://github.com/XaviDCR92/psxsdk),
+bringing in new features and bugfixes, is used for this project. A map editor
+is also available for operating systems supporting `Qt`.
 
-Airport is an open-source video game for the original Sony Playstation aka PSX/PS1. The player puts himself/herself in the role of an Air Traffic Controller (ATC), where lots of inbound/outbund flights need to be controlled without delays.
+The game has been successfully tested under real hardware (`SCPH-5502` and
+`SCPH-102`), `pcsxr`, `pSX` and `FPSe` without major issues. It is also
+compatible with [OpenSend](https://github.com/XaviDCR92/OpenSend), making it
+possible to stream game data from a computer over the serial port on the
+console, allowing quicker development under real hardware.
 
-### What is Airport written with?
+# How to build
+`Airport` has moved from a `Makefile`-based build system towards `cmake` for
+convenience, easier deployment and generation of `compile_commands.json`,
+useful for improved text completion on some IDEs. `cmake >= 3.13` is required.
+Before building, environment variable `PSXSDK_PATH` must be set to the path
+where `psxsdk` has been installed (e.g.: `/usr/local/psxsdk`).
 
-Airport is written using an open-source SDK called PSXSDK together with the GNU toolchain. PSXSDK can be freely [here](http://unhaut.x10host.com/psxsdk/ "PSXSDK official link"). However, a fork was created specifically from the 20150729 version with new experimental features and posted into [Github](https://github.com/XaviDCR92/psxsdk-20150729 "PSXSDK-20150729 fork").
+`Airport` can then be built using the typical process in CMake projects:
+
+```sh
+mkdir build && cd build/
+cmake .. -DCMAKE_EXPORT_COMPILE_COMMANDS=1
+cmake --build .
+```
+
+Once built, two files namely `airport.bin` and `airport.cue` inside the build
+directory (e.g.: `build`) can be used to play the game on an emulator or burn
+it into a CD-R to play it into a modchipped console.
+
+On the other hand, the map editor must be built using the Qt framework. Qt
+Creator automates the process and thus is the recommended way to go.
+
+# License
+`Airport` is licensed under the GPLv3 or later (read `LICENSE`) unless noted
+otherwise. Some assets with various permissive licenses are also used - see
+`LICENSE` files on each subfolder for further reference.