initial commit with basic level 0 on single machine

Dockerfile

@@ -0,0 +1,20 @@
+FROM ubuntu:22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+ARG levelNum=0
+
+RUN <<EOF
+useradd -m -s /bin/bash player${levelNum}
+echo 'root:superSecretRootPassword' | chpasswd
+echo "player${levelNum}:superSecretPlayerPassword${levelNum}" | chpasswd
+
+EOF
+
+COPY ./levels/level${levelNum} /home/player$levelNum
+
+USER player${levelNum}
+
+WORKDIR /home/player$levelNum
+
+CMD /bin/bash