Added screenshot

modules/docs/README.md

@@ -1,2 +1,13 @@
-# abp-docs
-ABP Documentation Module
+# docs module
+This module is used to create technical documentation web sites. [abp.io](https://abp.io) web site uses this module for its documentation.
+
+### Screenshot
+
+![screenshot](screenshot.png)
+
+### Main Features
+
+* Can read documents from a Github repository.
+* Supports Markdown document formatting.
+* Supports versioning (integrated to Github releases).
+* Support multiple projects.