Create README.md

Author: bronek89

README.md

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+# code-complexity
+
+Class for check code complexity score of php code.
+
+## Install
+
+```
+composer require bronek89/code-complexity
+```
+
+## Usage
+
+```php
+<?php
+
+$calculator = new \Bronek\CodeComplexity\CodeComplexityCalculator();
+$complexityScore = $calculator->calculate(file_get_contents('file.php'));
+
+echo "Code Complexity of file file.php is $complexityScore" 
+```