[amtk] docs: have a more-information.md file

[Sébastien Wilmet <swilmet src gnome org>]

commit a7f1d054f68c8d7162435d567dbadba9a7b5b6ce
Author: Sébastien Wilmet <swilmet informatique-libre be>
Date:   Sun Apr 17 17:14:07 2022 +0200

    docs: have a more-information.md file
    
    Similarly to the gspell project.

 README.md                | 20 ++++----------------
 docs/more-information.md | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 16 deletions(-)
---
diff --git a/README.md b/README.md
index 971ef4b..db2e8ed 100644
--- a/README.md
+++ b/README.md
@@ -5,21 +5,9 @@ Amtk is the acronym for “Actions, Menus and Toolbars Kit”. It is a basic
 GtkUIManager replacement based on GAction. It is suitable for both a
 traditional UI or a modern UI with a GtkHeaderBar.
 
-Dependencies
-------------
+More information
+----------------
 
-- GLib
-- GTK 3
+Amtk currently targets **GTK 3**.
 
-Documentation
--------------
-
-See the `gtk_doc` Meson option. A convenient way to read the API documentation
-is with the [Devhelp](https://wiki.gnome.org/Apps/Devhelp) application.
-
-See also the `docs/` directory for additional notes.
-
-Development and maintenance
----------------------------
-
-The project is in low-maintenance state.
+[More information about Amtk](docs/more-information.md).
diff --git a/docs/more-information.md b/docs/more-information.md
new file mode 100644
index 0000000..cc3cef2
--- /dev/null
+++ b/docs/more-information.md
@@ -0,0 +1,34 @@
+Amtk - more information
+=======================
+
+About versions
+--------------
+
+Amtk follows the even/odd minor version scheme.
+
+For example the `5.1.x` versions are unstable (development versions), and the
+`5.2.x` versions are stable.
+
+Dependencies
+------------
+
+- GLib
+- GTK 3
+
+Documentation
+-------------
+
+See the `gtk_doc` Meson option. A convenient way to read the API documentation
+is with the [Devhelp](https://wiki.gnome.org/Apps/Devhelp) application.
+
+See also other files in this directory for additional notes.
+
+Development resources
+---------------------
+
+- [Tarballs](https://download.gnome.org/sources/amtk/)
+
+Development and maintenance
+---------------------------
+
+The project is in low-maintenance state.