add log-in index for gin-cli (to be written)

README.md

@@ -17,6 +17,7 @@ introduction to how to deal with gin (web interface, command-line, and probably
 3. **gin-cli**
     - Downloading a bundle
     - Setting up for the wired network in Charité
+    - Log-in to Gin server
     - Downloading a repository
     - Committing to a repository
     - Uploading changes