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

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)