[MISC] - Added DEVELOPMENT.md to help contributers to set up the dev environment

DEVELOPMENT.md

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+
+This page is here to help you setup your devel environnment for starting to contribute to grocy.
+Feel free to share your setup if you think it can increase developper productivity.
+
+## Environment Set up
+
+Install PHP7 : 
+ - [Windows](https://windows.php.net/download#php-7.4)
+ - [Linux](https://www.php.net/distributions/php-7.4.5.tar.bz2) but using your distro package manager will do the job.
+
+Install Composer :
+
+- [Windows](https://getcomposer.org/doc/00-intro.md#installation-windows)
+- [Linux](https://getcomposer.org/doc/00-intro.md#downloading-the-composer-executable) but using your distro package manager will do the job
+
+Enable ext-fileinfo, ext-gd and pdo_sqlite in your php.ini, uncomment the line `extension=fileinfo`, `extension=gd2` and `extension=pdo_sqlite` in php.ini
+
+Run Composer to install dependencies
+
+```
+composer install
+```
+
+Copy ./config-dist.php to grocy's data directory  (./data) as config.php.
+
+Open newest config.php and set `MODE` to dev.
+And for convinience you can disable authentication by setting `DISABLE_AUTH` to true
+
+Create viewcache directory in `data` folder
+
+Install node_modules (You'll need Yarn for simplicity since npm don't support well installing node_modules outside of package.json's folder when package.json don't have a version field.)
+```
+yarn install
+```
+
+---
+
+Everything should be up and running by now, go to http://localhost:3000/ and see by yourself. 
+
+Note : If auth is enabled, the default username is admin and default password is admin)
+
+## Useful plugins for VSCode
+
+You may use whatever you want, the following list gather good ones that we use to develop Grocy.
+- [PHP Debug](https://marketplace.visualstudio.com/items?itemName=felixfbecker.php-debug)
+- [PHP Intellisense](https://marketplace.visualstudio.com/items?itemName=felixfbecker.php-intellisense)
+- [PHP Server](https://marketplace.visualstudio.com/items?itemName=brapifra.phpserver)
+- [Laravel Blade Snippets](https://marketplace.visualstudio.com/items?itemName=onecentlin.laravel-blade)