[atkmm/atkmm-2-28] Convert README to MD

[Kjell Ahlstedt <kjellahl src gnome org>]

commit c0aee23d5b1817d0715ad50e24fcabd1f4352c54
Author: Doomsdayrs <doomsdayrs gmail com>
Date:   Wed Jul 20 12:59:27 2022 +0200

    Convert README to MD
    
    Merge request !9

 README => README.md | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)
---
diff --git a/README b/README.md
similarity index 95%
rename from README
rename to README.md
index 8e4adee..6ab2ab3 100644
--- a/README
+++ b/README.md
@@ -1,3 +1,4 @@
+# atkmm
 atkmm is the C++ binding for the ATK library.
 This module is part of the GNOME C++ bindings effort <http://www.gtkmm.org/>.
 
@@ -13,8 +14,10 @@ See README.win32
 ## Building from a release tarball
 
 Extract the tarball and go to the extracted directory:
+```
   $ tar xf atkmm-@ATKMM_VERSION  tar xz
   $ cd atkmm-@ATKMM_VERSION@
+```
 
 It's easiest to build with Meson, if the tarball was made with Meson,
 and to build with Autotools, if the tarball was made with Autotools.
@@ -28,28 +31,35 @@ of untracked/.
 
 Don't call the builddir 'build'. There is a directory called 'build' with
 files used by Autotools.
-
+```
   $ meson --prefix /some_directory --libdir lib your_builddir .
   $ cd your_builddir
-
+```
 If the tarball was made with Autotools, you must enable maintainer-mode:
+```
   $ meson configure -Dmaintainer-mode=true
+```
 
 Then, regardless of how the tarball was made:
+```
   $ ninja
   $ ninja install
-
+```
 ### Building from a tarball with Autotools
 
 If the tarball was made with Autotools:
+```
   $ ./configure --prefix=/some_directory
+```
 If the tarball was made with Meson, you must enable maintainer-mode:
+```
   $ ./autogen.sh --prefix=/some_directory
-
+```
 Then, regardless of how the tarball was made:
+```
   $ make
   $ make install
-
+```
 ## Building from git
 
 Building from git can be difficult so you should prefer building from
@@ -65,20 +75,27 @@ Maintainer-mode is enabled by default when you build from a git clone.
 
 Don't call the builddir 'build'. There is a directory called 'build' with
 files used by Autotools.
-
+```
   $ meson --prefix /some_directory --libdir lib your_builddir .
   $ cd your_builddir
   $ ninja
   $ ninja install
+```
 You can create a tarball like so:
-  $ ninja dist
-
+```
+ $ ninja dist
+```
 ### Building from git with Autotools
-
+```
   $ ./autogen.sh --prefix=/some_directory
   $ make
   $ make install
+```
 You can create a tarball like so:
+```
   $ make distcheck
+```
 or
+```
   $ make dist
+```