Update part-of-speech.md

docs/tasks/part-of-speech.md

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 | 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/) |
 | 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:/UniversalDependencies/UD_Thai-PUD) |
 | thai-political-tweets | A small Thai political twitter dataset with UD POS tags | 41 tweets, 965 words | Unlicense License | Can Udomcharoenchaikit | [GitHub](https:/c4n/thai-political-tweets) |
+| 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:/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:/nlp-chula/thai-discourse-treebank/tree/main/data/th-tdtb) |
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 ## Software