feat: initialize newsletter project with IMAP email processing and Discord integration

- Add Cargo.toml for project dependencies
- Create Dockerfile for building and running the application
- Add docker-compose configuration for service management
- Implement email monitoring and processing in main.rs
- Parse emails and send notifications to Discord
- Include configuration file for IMAP and Discord settings

Dockerfile

@@ -0,0 +1,16 @@
+FROM rust:slim as builder
+
+WORKDIR /usr/src/app
+COPY . .
+
+RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/lib/apt/lists/*
+RUN --mount=type=cache,target=/usr/local/cargo/registry cargo build --release
+
+FROM debian:13-slim
+
+RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /usr/app
+COPY --from=builder /usr/src/app/target/release/newsletter .
+
+CMD ["./newsletter"]