Added README to testing with Docker (#3)

Author: olapiv

pink/rondis/README.md

@@ -0,0 +1,22 @@
+# Rondis
+
+## Running unit tests via Docker
+
+In case you are developing inside a Docker container and you wish to run unit tests against a RonDB cluster, you can choose between
+
+1. RonDB running as part of MTR tests
+2. RonDB running as a separate Docker Compose cluster
+
+In case you decide for the latter, you can spin up a cluster using [rondb-docker](https://github.com/logicalclocks/rondb-docker). Make sure when running it to have at least one open API slot with no Hostname specified. When a Docker Compose cluster is running, the container you are running from has to be added to the network of this cluster. Do so by running the following commands:
+
+```bash
+docker network list  # Search for the network name of the Docker Compose cluster
+docker network connect <cluster network> <development container id>
+```
+
+Once this is done, the Rondis server can be started up using:
+```bash
+./pink/rondis/rondis 1186 mgmd_1
+```
+
+whereby, `mgmd_1` is the container name of the first Management server.