Web editor documnetation

doc/workflow/README.md

@@ -10,3 +10,4 @@
 - [Migrating from SVN to GitLab](migrating_from_svn.md)
 - [Project importing from GitHub to GitLab](import_projects_from_github.md)
 - [Protected branches](protected_branches.md)
+- [Web Editor](web_editor.md)

doc/workflow/web_editor.md

+# GitLab Web Editor
+
+In GitLab you can create new files and edit existing one using our web editor. 
+Its really useful if you dont have access to command line or you want to make a quick small fix.
+You can access to web editor in several ways depends on context. 
+Lets start from newly created project. 
+Click on `Add a file` button to start web editor for creating first file.
+
+![web editor 1](web_editor/empty_project.png)
+
+Fill in file name, content, commit message and press commit button.
+After this file will be saved to repository.
+
+![web editor 2](web_editor/new_file.png)
+
+You can edit any text file in repository by pressing edit button when browsing file.
+
+![web editor 3](web_editor/show_file.png)
+
+Edit of file is pretty same as creating new file. 
+Except you can see preview of your changes to file in separate tab
+
+![web editor 3](web_editor/edit_file.png)