added sctructure.md

ROADMAP.md

@@ -4,6 +4,7 @@
 * Jenkins CI integration service
 * Usability improvements
+* Notification improvements
 ### v4.2 February 22

doc/install/structure.md

+## Description of GitLab structure
+
+
+### Directory structure
+
+    |-- home
+    |   |-- gitlab
+    |       |-- gitlab
+    |       |-- gitlab-satellites
+    |   |-- git
+    |       |-- repositories
+    |       |-- .gitolite
+
+
+gitlab
+  Holds all the code of gitlab application.
+
+gitlab-satellites
+  Contains a copy of all repositories with working tree. 
+  Used to automatically merge requests, edit files etc...
+
+repositories
+  Keeps all you repositories in bare format here
+