Base setup env instruction for contribution

.gitignore

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+/composer.lock
+/phpunit.xml
+/vendor/

CONTRIBUTING.md

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+# Contributing
+
+Everyone is welcome to contribute code.
+
+### 1. Development environment.
+
+#### Requirements
+
+- PHP >= 7.2
+- Symfony application.
+
+### 2. Creating Symfony Applications or use existing 
+
+See [symfony docs](https://symfony.com/doc/current/setup.html)
+
+```
+git clone [email protected]:YOUR_GITHUB_NAME/packeton.git
+git checkout -b fix/patch-1
+```
+
+### 3. Make a fork, install the dependencies.
+
+Make a fork on GitHub, and then create a pull request to provide your changes.
+
+Run composer install and make symlink with repo.
+
+```
+cd app
+composer require okvpn/cron-bundle
+
+git clone https://github.com/vtsykun/cron-bundle.git
+
+rm -rf vendor/okvpn/cron-bundle
+ln -s $PWD/cron-bundle vendor/okvpn/cron-bundle
+
+```
+