docs upd

docs/development.md

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+
+## Project setup for development
+
+```
+git clone git@github.com:filegator/filegator.git
+cd filegator
+cp configuration_sample.php configuration.php
+sudo chmod -R 777 private/
+sudo chmod -R 777 repository/
+composer install
+npm install
+npm run build
+```
+
+## Compiles and hot-reloads (backend and frontend on ports 8081 and 8080)
+
+```
+npm run serve
+```
+Once everything is ready visit: ```http://localhost:8080```
+
+## Run tests & static analysis
+
+```
+vendor/bin/phpunit
+vendor/bin/phpstan analyse ./backend
+```
+
+## Deployment
+
+Set the website document root to ```/dist``` directory.
+