docs: added ddev snippets

dev/ddev/README.md

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+# OpenMage DDEV environment
+
+__This is work-in-progress.__
+
+## Enable developer mode
+
+Set environment variables here:
+
+`.ddev/config.yaml`
+
+```
+web_environment: [
+    MAGE_IS_DEVELOPER_MODE=1
+]
+```
+
+## Use xDebug with PhpStorm
+
+If xdebug works not correctly with phpstorm.
+
+`.ddev/php/xdebug.ini`
+
+```
+[xdebug]
+xdebug.mode=debug
+xdebug.start_with_request=trigger
+```
+
+## Access DB in PhpStorm
+
+DDEV changes port numbers on every restart.
+
+If you use PhpStorms DB feature, it is helpful to use fixed port numbers. E.g. 
+
+`.ddev/config.yaml`
+
+```
+host_db_port: 6000
+```
+
+## Setup cronjob
+
+Run `ddev get drud/ddev-cron` first!
+
+`.ddev/config.cron.yaml`
+
+```
+hooks:
+  post-start:
+    - exec: printf "SHELL=/bin/bash\n* * * * * /var/www/html/cron.sh\n" | crontab
+
+```
+
+## Install compass
+
+[Compass](http://compass-style.org/) is required for editing scss-files from RWD-theme.
+
+`.ddev/web-build/Dockerfile.ddev-compass`
+
+```
+ARG BASE_IMAGE
+FROM $BASE_IMAGE
+RUN apt-get update
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -y -o Dpkg::Options::="--force-confold" --no-install-recommends --no-install-suggests build-essential ruby-full rubygems
+RUN gem install compass
+```
+
+https://stackoverflow.com/questions/61787926/how-can-i-get-sass-compass-into-the-ddev-web-container
+
+## Example command shortcut
+
+`.ddev/commands/web/phpstan`
+
+```
+#!/bin/bash
+
+## Description: run PHPStan
+## Usage: phpstan
+## Example: ddev phpstan <path-to-files>
+
+php vendor/bin/phpstan analyze -c .github/phpstan.neon "$@"
+```