add FreshRSS image

freshrss/README.md

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+## wonderfall/privatebin
+
+Paste securely.
+
+#### Features
+- Based on Alpine Linux (wonderfall/nginx-php image)
+- Uses [PrivateBin](https://github.com/PrivateBin/PrivateBin), originally a fork of zerobin by elrido.
+- Bundled with nginx and PHP7.1.
+
+#### Build-time variables
+- **PRIVATEBIN_VER** : version of PrivateBin
+
+#### Environment variables
+- **UID** : zerobin user id
+- **GID** : zerobin group id
+- **MEMORY_LIMIT** : php memory limit *(default : 128M)*
+- **UPLOAD_MAX_SIZE** : maximum upload size *(default : 10M)*
+
+#### Volumes
+- **/privatebin/data**
+
+#### Ports
+- **8888** [(reverse proxy!)](https://github.com/hardware/mailserver/wiki/Reverse-proxy-configuration)