Added Flatland.gif README.rst

README.rst

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      :target: https://gitlab.aicrowd.com/flatland/flatland/pipelines
      :alt: Test Coverage
 
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+.. image:: https://i.imgur.com/rKGEmsk.gif
+  :align: center
+  :width: 600px
 
 Flatland is a toolkit for developing and comparing multi agent reinforcement learning algorithms on grids.
 The base environment is a two-dimensional grid in which many agents can be placed. Each agent must solve one or more tasks in the grid world.