Installation instructions

Changes since the previous version

Added dfhack-config/df-ai.json. The file will be created if it does not exist when Dwarf Fortress is started.
The AI will generate a new world if it runs out of possible embarks or there is no world set. To use an existing world, set "random_embark_world" : "region1", (or some other region number) in the config file.
Movie recording is now disabled by default.
Site finder options can be adjusted in the config file.
The "wealth" event has been added to df-ai-events.json.
Fixed some cases of messages being delayed (such as the ai command without the AI enabled).