Add config file to describe plugin configuration Change-Id: I6d2d54375c18bc99e4883c2e6f5ff959fd24cc85

diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
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+Configuration
+=============
+
+The configuration of the @PLUGIN@ plugin is done in the `gerrit.config`
+file. This plugin overloads Gerrit own DRAFT workflow.  The WIP workflow
+can only be enabled, when DRAFT workflow in Gerrit was disabled.
+
+*Warning*: When DRAFT workflow was used in Gerrit, i. e. changes in
+status DRAFT still exist, they must be published or deleted before WIP
+workflow can be used.
+
+To disable DRAFT workflow the following must be set in `gerrit.config`:
+
+```
+  [change]
+    allowDrafts = false
+```
+WIP workflow can be used now.