Adding a bantu Functor (#32)

* added Bantu functor

*  added egekusii language based on Bantu functor

*  added kikamba language based on Bantu functor

*  added kiswahili language based on Bantu functor

src/kikamba/LangKam.gf

@@ -0,0 +1,11 @@
+--# -path=.:../abstract:../common:../api
+
+concrete LangKam of Lang = 
+  GrammarKam,
+  LexiconKam
+--  ,ConstructionKam
+    ** {
+
+
+
+} ;