Add Thai Discourse Treebank

docs/tasks/dependency_parser.md

@@ -5,6 +5,7 @@
 | ----------------------------- | ------------------------------------------------------------ | ---------------------------------- | ------------ | ------------------------------------------------------------ | ------------------------------------------------------------ |
 | 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) |
 | 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/) or [GitHub](https://github.com/KoichiYasuoka/spaCy-Thai/blob/master/UD_Thai-Corpora/th_blackboard.conllu) |
+| Thai Discourse Treebank                   | The Thai Discourse Treebank (TDTB) is a project at Chulalongkorn University, Bangkok, Thailand. The annotation adopts the sense inventory from PDTB 3.0. | 180 documents                    | - | Chulalongkorn University                                       | [GitHub](https://github.com/nlp-chula/thai-discourse-treebank/tree/main/data/th-tdtb) |
 
 
 ## Software