Adding README.md for examples/ssh-brute-force.

examples/ssh-brute-force/README.md

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+# SSH brute force
+
+Example to so how to collect the flows during a SSH brute force attack with [DOROTHEA](../../README.md) & [hydra](https://github.com/vanhauser-thc/thc-hydra).
+
+
+## Usage guide
+
+First create the resources specified in the compose file with out starting the container with the following command:
+```bash
+$ docker compose up --no-start
+```
+This step is needed for docker compose to create the network interface that we will use to listen on.
+The interface will be named in the form `br-5d02e59b9a78`, we will need to find the newly created adapter and substitude it on (dorothea-pmacctd.conf) under the field (**cap_interface:**)
+
+> This docker virtual network is needed since the default bridge adapter **docker0** does not support domain name resolution.
+> Or own created docker virtual network will support it allowing us to address the containers by the hostnames.
+
+### Find network interface name
+
+```bash
+$ ip a
+```
+If you are not sure which one is the right network interface, you can make user of the command:
+```bash
+$ docker network ls
+```
+
+## Start lab
+```bash
+$ docker compose up
+```
+
+## Stop lab
+```bash
+$ docker compose down
+```