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

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)