Update treebank.md

docs/tasks/treebank.md

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 | UD Thai PUD                   | This is a part of the Parallel Universal Dependencies (PUD) treebanks created for the CoNLL 2017 shared task on Multilingual Parsing from Raw Text to Universal Dependencies. | 1,000 sentences                    | CC BY-SA 3.0 | Universal Dependencies                                       | [GitHub](https://github.com/UniversalDependencies/UD_Thai-PUD) |
 | Thai Treebanks Dataset (thtb) | To enable research oppotunities with very few Thai Computational Linguitic resources, we willingly introduce fundamental high-level language resouces built with passion, Thai Treebanks, build from scratch for researchers and enthusiasts. | 5,200 sentences                    | CC BY 4.0    | Pechlada Seenual, Thodsaporn Chay-intr and Thanaruk Theeramunkong | [GitHub](https://github.com/tchayintr/thtb)                  |
-| Blackboard Treebank           | Blackboard Treebank is a Thai dependency corpus based on the LST20 Annotation Guideline. It features dependency structures, constituency structures, word boundaries, named entities, clause boundaries, and sentence boundaries. | 122,851 clauses (38,558 sentences) | CC BY 3.0    | Prachya Boonkwan, NECTEC                                     | [bitbucket](https://bitbucket.org/kaamanita/blackboard-treebank/) |
+| Blackboard Treebank           | Blackboard Treebank is a Thai dependency corpus based on the LST20 Annotation Guideline. It features dependency structures, constituency structures, word boundaries, named entities, clause boundaries, and sentence boundaries. | 122,851 clauses (38,558 sentences) | CC BY 3.0    | Prachya Boonkwan, NECTEC                                     | [bitbucket](https://bitbucket.org/kaamanita/blackboard-treebank/) |
+| Thai Universal Dependency Treebank (TUD)           | Thai Universal Dependency Treebank, consisting of 3,627 trees annotated in accordance with the Universal Dependencies (UD) framework.  | 3,627 trees  |   | Chulalongkorn University                                     | [GitHub](https://github.com/nlp-chula/TUD) |
+| Thai Discourse Treebank           | Thai Discourse Treebank is the first and largest Thai corpus annotated with explicit discourse relations in the style of the English Penn Discourse Treebank 3 scheme. The final corpus consists of 10,602 sentences from 384 documents, 180 of which have complete annotation of discourse connectives and its two argument spans.  |  |   | Ponrawee Prasertsom, Apiwat Jaroonpol, Attapol T. Rutherford                                     | [GitHub](https://github.com/nlp-chula/thai-discourse-treebank/tree/main/data/th-tdtb) |