Update README.md

README.md

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   - Lecture: Task-oriented vs general conversation systems. Overview of a framework for task-oriented systems. General conversation: retrieval and generative approaches. Generative models for general conversation. Retrieval-based models for general conversation.
   - Seminar: Simple retrieval-based question answering
 
-- [__week11__](https://github.com/yandexdataschool/nlp_course/tree/master/week11_gan) Adversarial learning & Latent Variables for NLP
+- [__week11__](https://github.com/yandexdataschool/nlp_course/tree/master/week11_gan) __Adversarial learning & Latent Variables for NLP__
   - Lecture: generative models recap, generative adversarial networks, variational autoencoders and why should you care about them.
   - Seminar: semi-supervised dictionary learning with adversarial networks
 
-- __week12-13 - TBA__
+- [__week12__](https://github.com/yandexdataschool/nlp_course/tree/master/week12_summarization) __Text Summarization__
+  - Lecture: Text summarization methods. Extractive vs abstractive. A piece of extractive text summarization. Abstractive text summarization.
+
 
 # Contributors & course staff
 Course materials and teaching performed by