feat: add Dockerfile and README for project setup

Dockerfile

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+FROM golang:1.25-alpine AS build
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY main.go ./
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /pois .
+
+FROM gcr.io/distroless/static-debian12:nonroot
+COPY --from=build /pois /pois
+ENTRYPOINT ["/pois"]

README.md

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+# Pois
+
+Discord bot that automatically joins a configured voice channel.
+
+## Environment
+
+Set the required environment variables in your shell. This project does not load `.env` files.
+
+```bash
+export DISCORD_TOKEN='your-bot-token'
+export CHANNEL_ID='your-voice-channel-id'
+```
+
+## Binary
+
+```bash
+go build -o pois .
+./pois
+```
+
+## Docker
+
+```bash
+docker build -t pois .
+docker run --rm -e DISCORD_TOKEN='your-bot-token' -e CHANNEL_ID='your-voice-channel-id' pois
+```