[libgpiod][RFC/RFT 08/18] README: document GLib bindings

[Bartosz Golaszewski <brgl@xxxxxxxx>]

From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

Add information on the requirements of and the configure build switch
for GLib bindings to libgpiod.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
 README | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/README b/README
index ec60ea1..8e1e1c7 100644
--- a/README
+++ b/README
@@ -206,13 +206,16 @@ Examples:
 BINDINGS
 --------
 
-High-level, object-oriented bindings for C++, python3 and Rust are provided.
-They can be enabled by passing --enable-bindings-cxx, --enable-bindings-python
-and --enable-bindings-rust arguments respectively to configure.
+High-level, object-oriented bindings for C++, GLib, python3 and Rust are
+provided. They can be enabled by passing --enable-bindings-cxx,
+--enable-bindings-glib, --enable-bindings-python and --enable-bindings-rust
+arguments respectively to configure.
 
 C++ bindings require C++11 support and autoconf-archive collection if building
 from git.
 
+GLib bindings requires GLib (as well as GObject, GIO and GIO-Unix) v2.54.
+
 Python bindings require python3 support and libpython development files. Please
 refer to bindings/python/README.md for more information.
 
-- 
2.40.1