Add examples directory with two example programs.

examples/README

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+This directory contains example programs showing how to use libserialport.
+
+The examples currently included are:
+
+list_ports.c - displays a list of ports on the system.
+port_info.c - displays info about a particular port on the system.
+
+The programs themselves are completely OS-independent, and require only a
+C compiler and libserialport.
+
+The Makefile in this directory will attempt to build all the examples,
+using 'gcc' to compile them and 'pkg-config' to discover the include
+paths and linker settings needed to build with libserialport. It provides
+a minimal example of how to write a Makefile to build a program using
+libserialport.
+
+If you have make, gcc, pkg-config and libserialport installed correctly
+then running 'make' should build the example programs in this directory.
+If this doesn't work, you may need to modify the Makefile or set necessary
+paths in your environment to suit your system.
+
+You can also build these examples using any other compiler, IDE or build
+system. You just need the libserialport.h header available to compile them,
+and the libserialport library available to link and run them.