update README.md

Author: 0m4r

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README.md

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 # MMM-covid19
-Magic Mirror Module to display stats on Covid19.
+Magic Mirror Module to display stats on Covid19.  
 Data is provided by _https://covid19api.com/_
 
 The data shown in the table displays the total numbers (top) and the difference calculated on the last 24 hours of available data. Reference timezone is UTC.
 
+## installation
+This 3rd party module install just like any other.  
+This Magic Mirror Forum thread describe a step-by-step procedure to install: [How to add modules. For absolute beginners.](https://forum.magicmirror.builders/topic/4231/how-to-add-modules-for-absolute-beginners?_=1622723520331)
+
+Check the configuration documentation below to ensure all set-up is done correctly.
+
+
 ## configuration
 the default configuration looks like this:
 ```js
@@ -22,25 +29,25 @@ the default configuration looks like this:
 }
 ```
 
-- `countryCodes`: an Array of ISO2 values.
+- `countryCodes`: an Array of ISO2 values.  
 A list cen be obtain at this url: https://api.covid19api.com/countries
 
-- `world`: a boolean value (`true` or `false`).
+- `world`: a boolean value (`true` or `false`).  
 Set to `true`it shows the world total numbers, it does not otherwise.
 
-- `live`: a boolean value (`true` or `false`).
-Set to `true`it shows the total numbers per country set in `countryCodes`, it does not otherwise.
+- `live`: a boolean value (`true` or `false`).  
+Set to `true` it shows the total numbers per country set in `countryCodes`, it does not otherwise.
 
-- `updateInterval`: a number in milliseconds to be used to refresh the numbers. Its value is only used when `useScheduler=false`.
+- `updateInterval`: a number in milliseconds to be used to refresh the numbers. Its value is only used when `useScheduler=false`.  
 Its default values invokes an API call every 24 hours from starting from the first one.
 
-- `useScheduler`: a boolean value (`true` or `false`).
+- `useScheduler`: a boolean value (`true` or `false`).  
 Set to `true` it uses _cron_ like approach to refresh the data. It uses [`node-schedule`](https://github.com/node-schedule/node-schedule), in order to be able to use thi option, you need to run `npm install`
 
-- `schedulerConfig`: a valid `node-schedule`configuration as a string or as an object.
+- `schedulerConfig`: a valid `node-schedule`configuration as a string or as an object.  
 Its default value execute an API call _twice a day every day ad 12am and 12pm UTC time_.
-
-
+  
+  
 The numbers shown are the delta between last day 00:00 UTC and the day before 00:00 UTC. The dates can be shown at the bottom of the list.
 
 ## screenshots