add dashboard desc

web-interface/dashboard.md

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+# Dashboard: how to use
+
+When you simply sign in to Gin, without selecting any specific repository,
+you fill find a page like below (note that this is just an example):
+
+![Dashboard overview](images/dashboard.png)
+
+This is called the "dashboard", and here you can see most of your activity on Gin.
+
+The dashboard may be divided into several areas:
+
+1. **Activity** area: shows what you did with your repositories
+2. **Collaborative repository** area: lists up the shared repositories you have access to
+3. **Private repository** area: lists up your _own_ repositories
+
+
+
+## Activity
+
+![Activity area](images/activity-area.png)
+
+This shows your recent activity on Gin, e.g.
+
+- your recent commits to your repositories
+- issues and comments reported to your repositories
+
+
+
+## Collaborative repositories
+
+![Collaborative repository area](images/collaboration-area.png)
+
+This area lists up the repositories **owned by others** and those you have access to.
+
+Normally, most of your repositories will show up here, as they are owned and managed by @larkumlab.
+
+
+
+## Private repositories
+
+![Private repository area](images/private-repositories.png)
+
+This area lists up the repositories owned by yourself.
+
+In many cases, these are visible only to you unless you add a [Collaborator](collaboration.md) to one of them.