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docs/getting_started.md

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-This page shows you how to get started using JANUS.
-
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+# Getting started
+
+JANUS contains a small CLI tool to help get set up with JANUS.
+
+## Install SOCRATES
+
+Download and install SOCRATES:
+
+```console
+janus download socrates
+```
+
+Make sure you have the netcdf fortran libraries installed:
+
+```
+sudo apt install libnetcdff-dev netcdf-bin
+```
+
+## Download data
+
+Download spectral and stellar data:
+
+```console
+janus download spectral
+janus download stellar
+```
+
+## Environment variables
+
+If you install and compile [SOCRATES](https://github.com/nichollsh/SOCRATES) yourself, you can specify the path using the `SOCRATES` environment variable, e.g.
+
+```console
+SOCRATES=/home/user/path/to/SOCRATES pytest
+```