Add README

README.md

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+# dodona-containerfile-evaluator
+
+dodona-containerfile-evaluator is part of the [Dodona Docker judge](https://github.com/dodona-edu/judge-docker).
+It's responsible for parsing the Containerfile and checking if it fulfills the requirements set by the config file.
+
+```
+Usage: dodona-containerfile-evaluator --config <path> <Containerfile>
+
+Arguments:
+  <Containerfile>  Containerfile to operate on
+
+Options:
+  -c, --config <path>  Sets a custom config file
+  -h, --help           Print help
+  -V, --version        Print version
+```
+
+Example config file:
+```json
+{
+  "from": {
+    "image": "alpine",
+    "tag": "3:20"
+  },
+  "user": "runner",
+  "workdir": "/course",
+  "comments": [ "docker run" ]
+}
+```