Add README

README.md

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+![screenshot of overview page](./demo/overview.png)
+![screenshot of details page](./demo/details.png)
+
+mycolog helps you keep an overview of your mushroom cultivation
+projects. It can store notes for each component, so that it's easier to
+remember which experiments succeeded and which failed. Genetics can be
+traced through family trees.
+
+# Installation
+You can download the precompiled program from the
+[releases page](https://github.com/codesoap/mycolog/releases).
+
+In order to get family trees displayed, you need to have Graphviz
+installed. You can download it [here](https://graphviz.org/download/).
+
+If you want to compile the program yourself, do this:
+
+```bash
+git clone git@github.com:codesoap/mycolog.git
+cd mycolog
+go install
+# The binary is now at ~/go/bin/mycolog.
+```