added slime volleyball gym example

Author: hardmaru

README.md

@@ -116,6 +116,26 @@ If you haven't bothered to run the previous training command, you can load the p
 python model.py cartpole_swingup zoo/cartpole_swingup.cma.json
 ```
 
+### Self-Contained Slime Volleyball Gym Environment
+
+<center>
+<img src="https://otoro.net/img/slimegym/state.gif" width="100%"/><br/>
+</center>
+
+Here is an example for training [slime volleyball gym](https://github.com/hardmaru/slimevolleygym) environment:
+
+Training command:
+
+```
+python train.py slimevolley -n 8 -e 8 -t 4 --sigma_init 0.5
+```
+
+Pre-trained model:
+
+```
+python model.py slimevolley zoo/slimevolley.cma.64.96.best.json
+```
+
 ### PyBullet Envs
 
 <center>

config.py

@@ -4,6 +4,18 @@
 
 games = {}
 
+slimevolley = Game(env_name='SlimeVolley',
+  input_size=12,
+  output_size=3,
+  time_factor=0,
+  layers=[20, 20],
+  activation='tanh',
+  noise_bias=0.0,
+  output_noise=[False, False, False],
+  rnn_mode=False,
+)
+games['slimevolley'] = slimevolley
+
 cartpole_swingup = Game(env_name='CartPoleSwingUp',
   input_size=5,
   output_size=1,