Add Config files

Config-files.md

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+Besides tagged ansible playbooks, each adaptive game needs a few config files to work.
+The config files are mostly YAML lists and dicts.
+`assistant.py` looks for config files in the `resources/` folder.
+
+The needed files are:
+- `levels.yml`
+- `hints.yml`
+- `level_keys.yml`
+- `level_requirements.yml`
+- `tools.yml`
+
+There are sample config files present in the `resources/` folder.
+(These are the files I created for the game I used in my thesis.)
+## levels.yml
+`levels.yml` tells the Game object what possible levels are in the game, what Ansible tags
+are needed for that level, and what machines need changes done.
+
+Each line of the file should be in the the following format:
+
+`level_name: {branch_name: [machines_to_provision]}`
+
+`branch_name` is not just the name of the branch, but also the Ansible tag used to provision the level.
+### level_keys.yml
+`level_keys.yml` is a dictionary of the level flags for the flag checker.
+
+The keys should be in the following format:
+`level_name: flag`
+## level_requirements.yml
+`level_requirements.yml` is the list of requirements for the level selector.
+The requirements should be in the following format:
+
+`level_name: [[branch_name, requirements]]`
+
+where `requirements` is either `null` or `[time, tool]`
+
+e.g. `level2: [[level2a, null], [level2b, [10, "SQL injection"]]]`
+`null` requirement means that this is the "default" version of the level.
+`[time, tool]` means that the player must know `tool` and have time less than `time`.
+
+The `tools` are expected to also be listed in `tools.yml`.
+## tools.yml
+`tools.yml` is a list of tools that the assistant will ask the player about before they play the game.
+
+If the player is familiar with a tool, they may be sent to a harder version of a level by the level selector.
+
+This file may also contain tools that do not appear in the game.
+
+## hints.yml
+`hints.yml` contains all the hints the player can receive, and should have the following format:
+
+`level_name: level+branch name: hint title: hint text`
+
+As hints are usually long, the sample file uses indentation to make the file better readable.