adding windows machine to Nagios (#2805)

Author: lumuchris256

ansible/playbooks/nagios/HOW_TO_ADD_WINDOWS_TO_NAGIOS.md

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+**Prerequisite**
+
+Create  a test server for running the Nagios_Server playbook on and a windows server VM using [this instruction.](https://github.com/adoptium/infrastructure/blob/master/ansible/README.md#can-i-have-multiple-vms-on-different-oss) 
+
+**Adding windows machine to nagios monitoring**
+
+To add a Windows host to a Nagios Server, we require NSClient++ plugin.
+
+The plugin acts as an intermediate between Nagios and Windows server.
+
+Thus, to add Windows host,  install NSClient++ plugin in the Windows machine first and then make changes in the Nagios configuration file.
+
+ Steps you need to follow in order to monitor a new Windows machine:
+
+1). Perform first-time prerequisites
+
+2). Install a monitoring agent on the Windows machine
+
+3). Create new host and service definitions for monitoring the Windows machine
+
+4). Restart the Nagios daemon
+
+**Changes in Windows server**
+
+1). Login as an administrator to the Windows server.
+
+2). Download and install the [NSclient package](https://www.nsclient.org/download/0.5.1/#0.5.1.45) based on the architecture.
+
+3). After downloading the file, double-click on the .msi file, to begin with, the installation and click on run.
+
+4). A Welcome screen appears, click on Next. Now  check "I accept the terms in the License Agreement".
+
+5). Choose Setup type as Typical and click on Next. In the next window, leave the default settings and click Next.
+
+6). Enter the Nagios Server IP in Allowed hosts and check all the modules and click Next then complete the install.
+
+ 7). From the start Menu, Start NSClient++
+
+**Changes In Nagios server**
+
+1). Login to the server where Nagios is installed.
+
+Edit the file windows.cfg using the command.
+```bash
+nano /usr/local/nagios/etc/objects/windows.cfg
+```
+In the configuration file, enter the details of the Windows server. In host_name, enter the hostname of the Windows server. In the address,specify the IP address of the Windows server. 
+
+2). open the Nagios configuration file using the command ,
+```bash
+nano /usr/local/nagios/etc/nagios.cfg
+```
+ uncomment the changes below and save.
+
+```bash
+cfg_file=/usr/local/nagios/etc/objects/windows.cfg
+```
+
+Run a sanity check on the configuration files by running Nagios with the -v command line option: 
+```bash
+/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
+```
+Restart nagios  
+
+Now browse the Nagios GUI.  Windows host is present on the dashboard.