additional benchmarks for a3c and dqn

benchmarks/dqn/README.md

@@ -11,4 +11,20 @@ python3 coach.py -p Atari_DQN -lvl breakout
 
 <img src="breakout_dqn.png" alt="Breakout DQN" width="800"/>
 
+### Pong DQN - single worker
+
+```bash
+python3 coach.py -p Atari_DQN -lvl pong
+```
+
+<img src="pong_dqn.png" alt="Pong DQN" width="800"/>
+
+### Space Invaders DQN - single worker
+
+```bash
+python3 coach.py -p Atari_DQN -lvl space_invaders
+```
+
+<img src="space_invaders_dqn.png" alt="Space Invaders DQN" width="800"/>
+