Added how to contribute section

MekDrop · web-flow · commit ac300add549e · 2018-03-22T13:42:51.000+02:00
diff --git a/README.md b/README.md
@@ -45,3 +45,9 @@ if ($instance instanceof ToArrayInterface) {
 }
 
 ```
+
+## How to contribute?
+
+If you want to add some functionality or fix bugs, you can fork, change and create pull request. If you not sure how this works, try [interactive GitHub tutorial](https://try.github.io).
+
+If you found any bug or have some questions, use [issues tab](https://github.com/imponeer/toarray-interface/issues) and write there your questions.

Original file line number	Diff line number	Diff line change
`@@ -45,3 +45,9 @@ if ($instance instanceof ToArrayInterface) {`
`45`	`45`	`}`
`46`	`46`
`47`	`47`	```
	`48`	`+`
	`49`	`+## How to contribute?`
	`50`	`+`
	`51`	`+If you want to add some functionality or fix bugs, you can fork, change and create pull request. If you not sure how this works, try [interactive GitHub tutorial](https://try.github.io).`
	`52`	`+`
	`53`	`+If you found any bug or have some questions, use [issues tab](https://github.com/imponeer/toarray-interface/issues) and write there your questions.`