Update README.md

added details from the spigot listing.

README.md

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-# MinecartSpeedPlus
-Plugin for bukkit, Spigot and Paper based Minecraft Servers to set specific speeds for minecarts both Dynamically and Globally.
+Native Minecraft Version: 1.13<br>
+Tested Minecraft Versions: 1.131.141.151.161.17<br>
+Contributors: Authors: varesa - Origional Author | rmellis - Update Author<br>
+Languages Supported: English<br>
+Donate:https://www.paypal.me/rmellis360 <br>
+Spigot: https://www.spigotmc.org/resources/minecart-speed-plus.69639/  <br>
+Polymart: https://polymart.org/resource/minecart-speed-plus.854 <br>
+![image](https://user-images.githubusercontent.com/41447552/122661160-4692a700-d17f-11eb-8335-2e2eb2ecaa51.png)
+![image](https://user-images.githubusercontent.com/41447552/122661162-50b4a580-d17f-11eb-982c-0566f5cff8c2.png)
+![image](https://user-images.githubusercontent.com/41447552/122661175-675afc80-d17f-11eb-973c-6ef453ac9239.png)
+![image](https://user-images.githubusercontent.com/41447552/122661219-b5700000-d17f-11eb-9e94-d83eb29c9347.png)
+![image](https://user-images.githubusercontent.com/41447552/122661231-db95a000-d17f-11eb-98b7-cc9f4d097bbe.png)
+![image](https://user-images.githubusercontent.com/41447552/122661238-f0723380-d17f-11eb-8bc3-e820d8513fd7.png)