Add READMEs (WIP) for Arabic, Basque, Estonian and Somali.

src/arabic/README.md

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+# Arabic
+
+## Language info
+
+* English name: Arabic
+* Autonym: العربية
+* ISO code: Ara
+
+## Authors
+
+* Ali El Dada, 2006-2009
+* Aarne Ranta, 200?-
+* Inari Listenmaa, 2018-
+
+## Publications
+
+* A. El Dada and A. Ranta. **Implementing an Open Source Arabic Resource Grammar in GF.**
+In M. Mughazy (ed), *Perspectives on Arabic Linguistics XX. Papers from the Twentieth Annual Symposium on Arabic Linguistics, Kalamazoo, March 26*
+John Benjamins Publishing Company.
+2007.
+  * An outline of the Arabic resource grammar project, focusing on linguistic aspects.
+
+* A. El Dada. **Implementation of the Arabic Numerals and their Syntax in GF.**
+*Computational Approaches to Semitic Languages: Common Issues and Resources*,
+ACL-2007 Workshop,
+June 28, 2007, Prague.
+2007.
+  * A case study with the resource grammar, focusing on the morphosyntax and agreement of constructions with numerals.
+
+## Implementation information
+
+The grammar is for vocalised Arabic.
+
+
+## Maintainer
+
+Inari Listenmaa (@inariksit)

src/basque/README.md

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+# Basque
+
+## Language info
+
+* English name: Basque
+* Autonym: Euskara
+* ISO code: Eus
+
+## Authors
+
+* Inari Listenmaa, 2015-
+* Francis Tyers, 2015-2016
+
+Thanks to Olatz Perez-De-Viñaspre for providing native help.
+
+## Publications
+
+-
+
+## Implementation information
+
+### Sources
+The implementation follows [Standard Basque: a progressive grammar](https://mitpress.mit.edu/books/standard-basque) by Rudolf P.G. de Rijk.
+
+[LexiconEus](LexiconEus.gf) and [Dictionary](https://github.com/GrammaticalFramework/wide-coverage/blob/master/translator/DictionaryEus.gf) have been derived from lexica
+in the [Apertium](https://github.com/apertium/apertium-eus) project.
+
+### Testing
+
+Verb morphology has been tested very rudimentarily against Apertium morphological
+lexicon, by method described [here](tests#readme). There are known errors in verb forms,
+especially for transitive and ditransitive verbs. Some moods and tenses have not been
+implemented yet.
+
+## Maintainer
+
+Inari Listenmaa (@inariksit)

src/estonian/README.md

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+# Estonian
+
+## Language info
+
+* English name: Estonian
+* Autonym: eesti keel
+* ISO code: Est
+
+## Authors
+
+* Kaarel Kaljurand, 2011-
+* Inari Listenmaa, 2011-
+
+## Publications
+
+* Listenmaa, Inari and Kaljurand, Kaarel (2014) **Computational Estonian Grammar in Grammatical Framework**. Proceedings of the SALTMIL Workshop at LREC2014. [Link](http://ixa2.si.ehu.es/~jipsagak/SALTMIL/LREC_2014_Workshop_Proceedings_Saltmil.pdf)
+
+## Implementation information
+
+### Sources
+
+The noun morphology is based on [Eesti käänamissüsteemi seaduspärasused](http://kjk.eki.ee/ee/issues/2012/6/156) (Kaalep, 2012).
+
+We  have  automatically  constructed  a  80k-word  lexicon from all the nouns, adjectives and adverbs in EstWN (v67); the verbs of the EstCG lexicon, which provides information on the verb complement and adjunct cases; and the database of multi-word verbs (Kaalep and Muischnek, 2008).  Morfessor 2.0 was used for compound word splitting of nouns, and Filosoft’s morphology tools were used to generate the base  forms  of  nouns  and  adjectives  (6  forms),  and  verbs (8 forms).
+
+### Testing
+
+Morphology has been tested against Filosoft's morphological analyser.
+
+Additionally, we have ported some of the existing GF ap-
+plications (MOLTO Phrasebook (Ranta et al., 2012), ACE-
+in-GF (Camilleri et al., 2012)) to Estonian.
+
+## Maintainers
+
+* Kaarel Kaljurand (@kaljurand)
+* Inari Listenmaa (@inariksit)

src/somali/README.md

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+# Somali
+
+## Language info
+
+* English name: Somali
+* Autonym: Af-Soomaali
+* ISO code: Som
+
+## Authors
+
+Inari Listenmaa, 2018-
+
+## Publications
+
+-
+
+## Implementation information
+
+Grammars by [John Saeed](https://benjamins.com/catalog/loall.10) and [Morgan Nilsson](http://morgannilsson.se/Kort%20somalisk%20grammatik.pdf) have been used
+in development. Saeed and Nilsson differ in orthography in some cases;
+this grammar follows Nilsson's convention, in which sentence type markers
+do not contract with subject pronouns.
+
+## Maintainer
+
+Inari Listenmaa (@inariksit)