(Swa) Add readme

src/swahili/README.md

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+# Swahili
+
+## Language info
+
+* English name: Swahili
+* Autonym: Kiswahili
+* ISO code: Swa
+
+## Authors
+
+2009: Initial work by Wanjiku Ng'ang'a and Juliet Mutahi. These files are in the subdirectory `old`.
+
+2018: New version by Benson Kituku, using the [Bantu functor](https://github.com/GrammaticalFramework/gf-rgl/tree/master/src/bantu).