Update README.md

README.md

@@ -25,8 +25,8 @@ The motivation of the hivex suite is to provide advanced reinforcement learning
 
 ## Available Environments
 
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+| Thumbnail                                                                                                                                                                                                                                                                                                            | Title                        | Tag                                     | Tasks          | Difficulty Levels |
+| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------- | --------------------------------------- | -------------- | ----------------- |
 | <a href="https://github.com/hivex-research/hivex-environments/tree/main/environments/Hivex_WindFarmControl/"><img src="https://raw.githubusercontent.com/hivex-research/hivex/main/docs/images/WFC_thumb.jpg" height="auto" width="200" style="border-radius:10px" alt="Wind Farm Control"></a>                      | Wind Farm Control            | <code>WindFarmControl</code>            | <code>2</code> | <code>9</code>    |
 | <a href="https://github.com/hivex-research/hivex-environments/tree/main/environments/Hivex_WilfireResourceManagement/"><img src="https://raw.githubusercontent.com/hivex-research/hivex/main/docs/images/WRM_thumb.jpg" height="auto" width="200" style="border-radius:10px" alt="Wildfire Resource Management"></a> | Wildfire Resource Management | <code>WildfireResourceManagement</code> | <code>3</code> | <code>10</code>   |
 | <a href="https://github.com/hivex-research/hivex-environments/tree/main/environments/Hivex_DroneBasedReforestation/"><img src="https://raw.githubusercontent.com/hivex-research/hivex/main/docs/images/DBR_thumb.jpg" height="auto" width="200" style="border-radius:10px" alt="Drone-Based Reforestation"></a>      | Drone-Based Reforestation    | <code>DroneBasedReforestation</code>    | <code>7</code> | <code>10</code>   |