Add empty template

Dockerfile

+FROM alpine:latest
+
+ENTRYPOINT ["/bin/sh", "-c", "exit 1"]
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README.md

+# Empty Dojo Template
+
+This is an empty template for a Dojo assignment.
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docker-compose.yml

+services:
+    empty_container:
+        container_name: empty_container
+        build:
+            context: ./
+            dockerfile: Dockerfile
+        volumes:
+            - empty_volume:/empty_dir/
+volumes:
+    empty_volume:
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dojo_assignment.json

+{
+    "dojoAssignmentVersion": 1,
+    "version": 1,
+    "immutable": [
+        {
+            "description": "Dockerfile of the empty container",
+            "path": "Dockerfile",
+            "isDirectory": false
+        }
+    ],
+    "result": {
+        "container": "empty_container",
+        "volume": "empty_volume"
+    }
+}
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