add a example to configure sflphone

exampleConfigure.sh

+#!/bin/sh
+
+SFL_PREFIX=/home/$HOME/sflphone
+
+export LD_LIBRARY_PATH=$SFL_PREFIX/lib
+export LDFLAGS="-L$SFL_PREFIX/lib"
+export CPPFLAGS="-I$SFL_PREFIX/include/cc++2 -I$SFL_PREFIX/include"
+export PKG_CONFIG_PATH=$SFL_PREFIX/lib/pkgconfig
+
+./configure --prefix=$SFL_PREFIX --enable-strict || exit
+make || exit
+make install || exit