isso: add README.md

isso/README.md

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+## wonderfall/isso
+
+![](https://i.goopics.net/q1.png)
+
+
+#### What is this?
+Isso is a commenting server similar to Disqus. More info on the [official website](https://posativ.org/isso/).
+
+#### Features
+- Based on Alpine Linux 3.3.
+- Latest Isso installed via pip.
+
+#### Environment variables
+- **GID** : isso group id.
+- **UID** : isso user id.
+
+#### Volumes
+- **/config** : configuration files.
+- **/db** : location of SQLite database.
+
+#### Example of simple configuration
+Here is the full documentation : https://posativ.org/isso/docs/
+```
+# /mnt/docker/isso/config/isso.conf
+[general]
+dbpath = /db/comments.db
+host = https://cats.schrodinger.io/
+[server]
+listen = http://0.0.0.0:8080/
+
+# docker-compose.yml
+isso:
+  image: wonderfall/isso
+  environment:
+    - GID=1000
+    - UID=1000
+  volumes:
+    - /mnt/docker/isso/config:/config
+    - /mnt/docker/isso/db:/db
+```
+
+#### Reverse proxy
+https://github.com/Wonderfall/dockerfiles/tree/master/reverse