[glibmm/glibmm-2-58] Add few installation instructions

[Kjell Ahlstedt <kjellahl src gnome org>]

commit c050fe98cc8819ede90a88935f0bd480352442fb
Author: Tapasweni Pathak <tapasweni pathak ril com>
Date:   Sat Jan 19 21:36:24 2019 +0530

    Add few installation instructions

 README | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/README b/README
index 341c67e4..ba84b334 100644
--- a/README
+++ b/README
@@ -1,4 +1,12 @@
 This is glibmm, a C++ API for parts of glib that are useful for C++.
 See http://www.gtkmm.org
 
+Installation Procedure
+----------------------
+
+$ tar xf glibmm-@GLIBMM_VERSION  tar gz
+$ cd glibmm-@GLIBMM_VERSION@
+$ ./configure --prefix=/some_directory
+$ make
+$ make install