add documentation

parsoid/README.md

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+## wonderfall/parsoid
+
+#### What is this? What features?
+- A **simple** Parsoid image.
+- Based on Alpine Linux so it's lightweight!
+- Bundled with latest node.js available (version check is disabled).
+
+#### Build-time variables
+- **VERSION** : version of Ghost.
+
+#### Environment variables
+- **GID** : ghost user id *(default : 991)*
+- **UID** : ghost group id *(default : 991)*
+- **ADDRESS** : your address *(default : http://localhost/w/)*
+- **DOMAIN** : name of the container *(default : localhost)*
+
+### docker-compose.yml sample
+
+```
+mywiki-parsoid:
+  image: wonderfall/parsoid
+  container_name: mywiki-parsoid
+  environment:
+     - UID=1669
+     - GID=1669
+     - ADDRESS=https://wiki.domain.com/
+     - DOMAIN=mywiki-parsoid
+```