Added readme with project acknowledgment and general info.

src/latvian/README.md

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+# Latvian GF Resource Grammar
+
+There is an ongoing work to develop a wide-coverage reimplementation of the Latvian RGL morphology, based on [Tezaurs.lv](https://tezaurs.lv) dictionary data. Currently, the reimplementation covers noun paradigms and lexical entries, which will be followed by other parts of speech, eventually substituting the legacy Latvian RGL morphology.
+
+The reimplemented morphology and lexicon module consists of the following components:
+- `PortedMorphoParadigmsLav.gf`: automatically converted paradigm desrciptions from the [Latvian Morphological Toolkit](https://github.com/LUMII-AILab/Morphology/); please, DO NOT EDIT.
+- `PortedMorphoStemchangesLav.gf`: manually ported stemchange functions for the above mentioned paradigms; must be kept aligned with the [source code](https://github.com/LUMII-AILab/Morphology/blob/master/src/main/java/lv/semti/morphology/analyzer/Mijas.java) of the toolkit.
+- `PortedTezaursDictLav.gf` and `PortedTezaursDictLavAbs.gf`: automatically exported lexicon data from [Tezaurs.lv](https://tezaurs.lv); please, DO NOT EDIT.
+- `PortedMorphoUtilsLav.gf`: utility functions.
+
+For edits and improvements, please, contact us at lauma@ailab.lv!
+
+
+## Acknowledgements
+
+The work on porting Tezaurs.lv inflectional paradigms to GF and creating a wide-coverage computational GF lexicon for Latvian was funded by the Latvian Council of Science under the grant agreement lzp-2022/1-0443 ([Advancing Latvian Computational Lexical Resources for Natural Language Understanding and Generation](https://wordnet.ailab.lv/project2)).