Created Operators (markdown)

Operators.md

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+# Operators must have a space around them
+
+Operators must be readable and therefore should have spaces around them.
+
+<details><summary>Example</summary><div><br>
+
+**Bad**
+
+```PHP
+$text='Hello '.$name.'!';
+```
+
+**Good**
+
+```PHP
+$text = 'Hello ' . $name . '!';
+```
+
+</div></details><br>
+
+_Reference_: [`Squiz.WhiteSpace.OperatorSpacing`](https://github.com/squizlabs/PHP_CodeSniffer/blob/master/src/Standards/Squiz/Sniffs/WhiteSpace/OperatorSpacingSniff.php)