Then I strongly recommend using OH 2.2 instead of 2.0. You don’t want to get started on an already outdated version.
This is a standalone program and not an OH addon. To use it you will install and run this program and test it according to however the developer documents doing. I would then manually test using an MQTT client like MQTT.fx to manually send commands and read messages just to make sure that part is working.
Once all that outside of openHAB stuff works, see MQTT Binding (v1.11) Getting Started 101 to get started using the MQTT binding with openHAB to send and receive messages to Broadlink-MQTT.
Similarly, this is not an openHAB addon. This is a standalone command line program. Follow the instructions the developer provides to install and test that it works. Once you have that working, you can use the Exec binding to call these scripts.
I personally recommend the MQTT approach. I think it will be easier in the long run to configure it that way.
Follow the instructions at the respective github repos.
That is because neither of these are openHAB addons. Both are just python scripts. The checking comment on Broadlink-MQTT is referring to a change made that will let it work better with OH, but that does not mean that it is an openHAB addon.
The word “openHAB” appears nowhere in the BlackBeanControl project at all as far as I can tell.