Update README.md

Author: slayoo

README.md

@@ -4,4 +4,6 @@
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-utility routines used in PySDM and PyMPDATA examples and tests
+utility routines used in [PySDM](https://github.com/atmos-cloud-sim-uj/PySDM) and [PyMPDATA](https://github.com/atmos-cloud-sim-uj/PyMPDATA) examples and tests
+
+public API docs are maintained at: https://atmos-cloud-sim-uj.github.io/utils/