Update README.md

Author: RuedigerLunde

README.md

@@ -113,7 +113,7 @@ Java implementation of algorithms from [Russell](http://www.cs.berkeley.edu/~rus
 |19.2|771|Current-Best-Learning|[CurrentBestLearning](/aima-core/src/main/java/aima/core/learning/knowledge/CurrentBestLearning.java)|
 |19.3|773|Version-Space-Learning|[VersionSpaceLearning](/aima-core/src/main/java/aima/core/learning/knowledge/VersionSpaceLearning.java)|
 |19.8|786|Minimal-Consistent-Det|[MinimalConsistentDet](/aima-core/src/main/java/aima/core/learning/knowledge/MinimalConsistentDet.java)|
-|19.12|793|FOIL|---|
+|19.12|793|FOIL|[FOIL](https://github.com/aimacode/aima-java/blob/AIMA3e/aima-core/src/main/java/aima/core/learning/knowledge/FOIL.java)|
 |21.2|834|Passive-ADP-Agent|[PassiveADPAgent](/aima-core/src/main/java/aima/core/learning/reinforcement/agent/PassiveADPAgent.java)|
 |21.4|837|Passive-TD-Agent|[PassiveTDAgent](/aima-core/src/main/java/aima/core/learning/reinforcement/agent/PassiveTDAgent.java)|
 |21.8|844|Q-Learning-Agent|[QLearningAgent](/aima-core/src/main/java/aima/core/learning/reinforcement/agent/QLearningAgent.java)|