Adds examples for Operating System related utility functions;

Signed-off-by: Ashwin Hegde <ashwin.hegde3@gmail.com>

Author: hegdeashwin

Kit/Session-3/OS/os.js

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+/***
+ * The goal of this file is to know about the Operating System functions;
+ *
+ * We need to use require('os') Build-In NPM to get access to dew basic
+ * operating system related utility functions.
+ *
+ * How to run this example:
+ * 1. node os.js
+ * 2. See the message get displayed on prompt.
+ */
+
+/***
+ * Note: Use require('os') to get access to os based utility functions.
+*/
+var os = require('os');
+
+/***
+ * Returns the hostname of the operating system.
+*/
+console.info("Hostname is: %s", os.hostname());
+
+/***
+ * Returns the name of the operating system.
+*/
+console.log("Type is %s", os.type());
+
+/***
+ * Returns the platform of the operating system.
+*/
+console.log("Platform is %s", os.platform());
+
+/***
+ * Returns the operating system CPU architecture.
+*/
+console.log("CPU Architecture is %s", os.arch());
+
+/***
+ * Returns the operating system release.
+*/
+console.log("Release is %s", os.release());
+
+/***
+ * Returns the operating system uptime in seconds.
+*/
+console.log("Uptime is %d Seconds", os.uptime());
+
+/***
+ * Returns the operating system total amount of system memory in bytes.
+*/
+console.log("Total amount of system memory is %d in bytes", os.totalmem());
+
+/***
+ * Returns the operating system the amount of free system memory in bytes.
+*/
+console.log("Total amount of free system memory is %d in bytes", os.freemem());
+
+/***
+ * Returns the operating system's default directory for temp files.
+*/
+console.log("Temp directory is", os.tmpDir());
+
+/***
+ * Returns an array of objects containing information about each CPU/core installed:
+ * model, speed (in MHz), and times
+*/
+console.log("Information about CPU/Core Installed:\n");
+console.log(os.cpus());
+
+/***
+ * Returns get a list of network interfaces:
+*/
+console.log("List of network interfaces:\n");
+console.log(os.networkInterfaces());