Update README.md

Z80coder · web-flow · commit 7ec4bf645188 · 2020-04-28T11:28:37.000+01:00
diff --git a/README.md b/README.md
@@ -8,4 +8,6 @@ not yet alpha!
 
 ## Documentation
 
+- [Doxygen code documentation](https://z80coder.github.io/datalog-cpp/)
+- [How to build](./docs/build.md)
 - [Quick git how to](./docs/git-how-to.md)
