Added a Dockerfile and example configs

.dockerignore

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+.git/
+target/
+tmp/
+*.json
+*.md
+*.abbj
+*.example

Dockerfile

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+FROM rust:1.43.1-slim-stretch as build
+COPY . /project
+WORKDIR /project
+RUN apt-get update \
+    && apt-get install -y pkg-config libssl-dev curl
+RUN cargo build --release
+
+FROM debian:stretch-slim
+RUN apt-get update \
+    && apt-get install -y curl \
+    && rm -rf /var/lib/apt/lists/*
+COPY --from=build /project/target/release/animebox-sync /usr/bin/animebox-sync
+WORKDIR /app
+CMD ["animebox-sync", "backup.abbj", "download"]

README.md

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+# AnimeBox Sync
+
+A tool to read AnimeBox backup files and download the favorited files
+
+## Usage
+
+### Docker
+
+To download all favorites from a backup file.
+
+```bash
+docker run -v <abbj file>:/app/backup.abbj -v <save directory>:/app/tmp/ -v <state file>:/app/state.json sothr/animebox-sync:latest
+```
+
+To list all searches from a backup file.
+
+```bash
+docker run -v <abbj file>:/app/backup.abbj sothr/animebox-sync:latest animebox-sync backup.abbj searches
+```

config.json.example

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+{
+  "save_directory": "tmp"
+}

state.json.example

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+{
+    "downloaded": []
+}