Documentation instances distinction (#129)

* Documentation instances distinction

Making it clear that formatters & console can be accessed only from static module. Issue #106

* naming consistency

Co-authored-by: Nathan Bierema <nbierema@gmail.com>

* reformat README

Co-authored-by: Nathan Bierema <nbierema@gmail.com>

---------

Co-authored-by: Nathan Bierema <nbierema@gmail.com>

Author: piomar123

README.md

@@ -180,17 +180,20 @@ npm install jsondiffpatch
 ```
 
 ```js
-var jsondiffpatch = require('jsondiffpatch').create(options);
+var jsondiffpatch = require('jsondiffpatch');
+var jsondiffpatchInstance = jsondiffpatch.create(options);
 ```
 
+Some properties are available only from static main module (e.g. formatters, console), so we need to keep the reference to it if we want to use them.
+
 ### browser
 
 In a browser, you could load directly a bundle in `/dist`, eg. `/dist/jsondiffpatch.umd.js`.
 
 ## Options
 
 ```javascript
-var jsondiffpatch = require('jsondiffpatch').create({
+var jsondiffpatchInstance = require('jsondiffpatch').create({
   // used to match objects when diffing arrays, by default only === operator is used
   objectHash: function (obj) {
     // this function is used only to when objects are not equal by ref