add mediawiki

mediawiki/README.md

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+## wonderfall/freshrss
+
+A free, self-hostable aggregator : https://github.com/FreshRSS/FreshRSS
+
+#### Features
+- Based on Alpine Linux (wonderfall/nginx-php image)
+- Bundled with nginx and PHP7.1.
+- Automatic feed update (frequency at 30 minutes by default)
+
+#### Build-time variables
+- **FRESHRSS_VER** : version of FreshRSS
+
+#### Environment variables
+- **UID** : user id
+- **GID** : group id
+- **MEMORY_LIMIT** : php memory limit *(default : 128M)*
+- **UPLOAD_MAX_SIZE** : maximum upload size *(default : 10M)*
+- **CRON_PERIOD** : feed update frequency *(default : 30m)*
+
+#### Volumes
+- **/freshrss/data**
+
+#### Ports
+- **8888** [(reverse proxy!)](https://github.com/hardware/mailserver/wiki/Reverse-proxy-configuration)