DOC WIP: getting started

src/doc/getting_started.md

 # Getting started with pycaosdb #
 
-1. Install
-2. import
-3. enjoy
+## Installation ##
+
+### Requirements ###
+
+Pycaosdb needs at least Python 3.6.  Additionally, the following packages are required (they will
+typically be installed automatically):
+
+- `lxml`
+- `PyYaml`
+- `PySocks`
+
+### How to install ###
+
+To install pycaosdb locally, use `pip` (called `pip3` on some systems) in the top-level directory:
+
+```sh
+pip3 install --user .
+```
+
+## - Install - import - enjoy ##
+
+*TODO*