Added requirements.

docs/requirements/requirements_overview.rst

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+=====================
+requirements overview
+=====================
+
+Vision
+------
+
+*novelibre* helps novelists to plan extensive novels and to keep track of them
+during creation and revision.
+
+Theme
+-----
+
+*novelibre* is an add-on to OpenOffice or LibreOffice that helps to break down
+large novels into parts, chapters and sections, all of which are provided with
+additional information called metadata.
+The metadata remain permanently associated with the chapters and sections
+in the ODT manuscript throughout the work on the novel.
+*novelibre* makes information about the story world accessible and and relates
+characters, locations, and items to the sections.
+*novelibre* can hold information about plot lines and plot points that are
+assigned to the sections.
+
+Features
+--------
+
+Application
+~~~~~~~~~~~
+
+- *novelibre* works off-line.
+- *novelibre* provides a graphical user interface.
+- *novelibre* can launch OpenOffice or LibreOffice, which must be set as the
+  default applications for the ODT and ODS file format.
+- *novelibre* can launch the system web browser to display HTML reports.
+- *novelibre* can launch the system web browser to open the online user manual.
+
+Project storage
+~~~~~~~~~~~~~~~
+
+- *novelibre* stores its data off-line in the local file system.
+- *novelibre* stores its data in an XML-based file format.
+- *novelibre* backs up the previous project version when saving the project.
+
+
+Story structure
+~~~~~~~~~~~~~~~
+
+- *novelibre* shows the story structure in an editable project tree.
+- Optionally, *novelibre* can import a story structure from an Office document.
+- Optionally, the user can add chapters and sections while editing the manuscript.
+
+
+Office dokuments to work on
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- *novelibre* exports ODF documents that can be reimported to update the project.
+
+
+Final manuscript
+~~~~~~~~~~~~~~~~
+
+- *novelibre* exports a neatly formatted ODT manuscript to which different templates
+  can easily be applied.
+
+

docs/requirements/user_stories.rst

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+============
+User stories
+============
+
+Application
+-----------
+
+- Launch the application.
+- Exit the application.
+
+
+Project storage
+---------------
+
+- Open an existing project in order to work on.
+- Save the current project in order to apply changes.
+- Close the application in order to finish the session.
+- Close the project without saving in order to discard changes.
+- Restore the last saved version in order to undo unsaved changes.
+- Restore the latest backup version, if any, in order to undo saved changes.
+- Save the current project under another file name in order to create a copy.
+- Open the directory that contains the current project in order
+  to have direct acccess to the project documents.
+- Add a style sheet to the project file in order to view the project
+  with a web browser.