Working docker-compose files for development

docker/php/Dockerfile

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+FROM php:7.3-fpm
+
+RUN docker-php-ext-install mysqli pdo openssl mbstring tokenizer curl json gmp

docker/php/www.conf

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+[www]
+
+user = www-data
+group = www-data
+
+listen = :9000
+
+pm = dynamic
+pm.max_children = 5
+pm.start_servers = 2
+pm.min_spare_servers = 1
+pm.max_spare_servers = 3