add docs to readme
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+
## TreeTime: maximum likelihood dating and ancestral sequence inference
### Overview
@@ -10,6 +12,7 @@ TreeTime provides routines for ancestral sequence reconstruction and inference o
To optimize the likelihood of time-scaled phylogenies, TreeTime uses an iterative approach that first infers ancestral sequences given the branch length of the tree, then optimizes the positions of unconstrained nodes on the time axis, and then repeats this cycle.
The only topology optimization are (optional) resolution of polytomies in a way that is most (approximately) consistent with the sampling time constraints on the tree.
The package is designed to be used as a stand-alone tool on the command-line or as a library used in larger phylogenetic analysis work-flows.
+[The documentation of TreeTime is hosted on readthedocs.org](https://treetime.readthedocs.io/en/latest/).
In addition to scripting TreeTime or using it via the command-line, there is also a small web server at [treetime.ch](https://treetime.biozentrum.unibas.ch/).
