add plan for MVP and add mockup

stories/README.md

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+# Description
+
+This is a small multiplayer game.
+
+Each player starts a story by writing a sentence. 
+Then the story is passed to the next player.
+Each player only sees the last sentence and writes a sentence to continue the story.
+After a predefined number of rounds the game is finished.
+The resulting stories are presented to all players.
+
+# Installation
+pip install -r requrements.txt
+
+# Usage
+python manage.py migrate
+python manage.py runserver
+
+# Technical Overview
+
+To start a game a StoryRound is started. 
+Participants are added, and an ordering of Participants is selected and a .
+
+To start every Participant gets a Story and starts it with a sentence (StoryPart).
+Then the story is passed to the next Participant according to the ordering.
+
+# MVP Plan
+
+![Mockup](documentation/user_interface_mockup.png)
+
+- [ ] Create Form to start a StoryRound (with forced alphabetical ordering)
+- [ ] Build Sentence writing page
+- [ ] Build result view
+- [ ] include open and past round links in start page 
+
+# Backlog
+- [ ] Create Wizzard for StoryRound including custom Ordering