[frogr] meson: Update the INSTALL and README files to the new situation

[Mario Sanchez Prada <msanchez src gnome org>]

commit 2232507cc9bd622176bc5eb72ffdff685438a47b
Author: Mario Sanchez Prada <msanchez gnome org>
Date:   Tue May 23 21:07:13 2017 +0100

    meson: Update the INSTALL and README files to the new situation

 INSTALL |   18 ++++++++++++------
 README  |    3 ++-
 2 files changed, 14 insertions(+), 7 deletions(-)
---
diff --git a/INSTALL b/INSTALL
index 63b8ba4..77dab56 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,13 +1,19 @@
 Compiling from source code
 ==========================
 
-To compile and try the application you can just do this:
+To compile and try the application you need to have meson and ninja
+installed, but you can still use the usual commands defined by
+the build API (see https://github.com/cgwalters/build-api):
 
- $ ./autogen.sh
+ $ ./configure
  $ make
- $ sudo make install
- $ frogr
+ $ make install
 
-To uninstall just do:
+To use meson and ninja, instead of using the wrapper configure script:
 
- $ sudo make uninstall
\ No newline at end of file
+ $ meson . BUILD
+ $ ninja -C BUILD
+ $ ninja -C BUILD install
+
+...and then you can run it from the directory you installed it with the
+previous commands (/usr/local by default unless --prefix is used).
diff --git a/README b/README
index 33f7c4e..a378442 100644
--- a/README
+++ b/README
@@ -8,8 +8,9 @@ To get the source, please checkout the git repository at gnome.org:
 
     git clone git://git.gnome.org/frogr
 
-To work properly, frogr needs some libraries to be installed first:
+To be able to build frogr, you'll need some tools and libraries:
 
+ - meson, ninja and a C compiler (e.g. gcc, clang)
  - glib (version 2.44 or higher)
  - gtk+ (version 3.4 or higher)
  - json-glib (version 0.12 or higher)