[gnome-games] hacking: Add build instructions

[Adrien Plazas <aplazas src gnome org>]

commit 08b47a154e7f4886d50a20cc9f0785a7fc690688
Author: RoubyPA <pa rouby gmail com>
Date:   Sat Dec 2 13:51:21 2017 +0100

    hacking: Add build instructions
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788692

 HACKING | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
---
diff --git a/HACKING b/HACKING
index de19eb8..fe74d85 100644
--- a/HACKING
+++ b/HACKING
@@ -56,3 +56,37 @@ window.
 
 This allows consistency and helps to quickly know which widget
 represents what.
+
+Compilation and installation Procedure
+======================================
+
+You can install this project either manually (by command line) or
+with [Builder](https://wiki.gnome.org/Apps/Builder "GNOME-Builder Wiki").
+
+## Manual installation
+
+### Get the official git repository
+```shell
+git clone https://git.gnome.org/browse/gnome-games
+```
+
+### Required dependencies
+Games always requires the matching version of [retro-gtk](https://git.gnome.org/browse/retro-gtk/)
+and [libmanette](https://gitlab.gnome.org/aplazas/libmanette),
+so if you use the master version of Games, you need to use
+the master version of retro-gtk and libmanette.
+
+### Prepare compilation
+```shell
+./autogen.sh && ./configure
+```
+
+### Compilation
+```shell
+make
+```
+
+### Install the application
+```shell
+sudo make install
+```
\ No newline at end of file