Add pictures for documentation and snapserver config

snapserver/dockerfile

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+FROM rust:1.45 AS librespot
+
+RUN apt-get update \
+ && apt-get -y install build-essential portaudio19-dev curl unzip \
+ && apt-get clean && rm -fR /var/lib/apt/lists
+
+ARG ARCH=amd64
+ARG LIBRESPOT_VERSION=0.1.3
+
+COPY ./install-librespot.sh /tmp/
+RUN /tmp/install-librespot.sh
+
+FROM debian:bullseye
+
+ARG SNAPCASTVERSION=0.21.0
+ARG SNAPCAST_FILE="0.21.0-1"
+
+RUN apt-get update \
+ && apt-get install wget -y \
+ && wget 'https://github.com/badaix/snapcast/releases/download/v'$SNAPCASTVERSION'/snapserver_'$SNAPCAST_FILE'_amd64.deb' \
+ && dpkg -i --force-all 'snapserver_'$SNAPCAST_FILE'_amd64.deb' \
+ && apt-get -f install -y \
+ && apt-get clean && rm -fR /var/lib/apt/lists
+
+COPY --from=librespot /usr/local/cargo/bin/librespot /usr/local/bin/
+
+COPY run.sh /
+CMD ["/run.sh"]
+
+ENV DEVICE_NAME=Snapcast
+EXPOSE 1704/tcp 1705/tcp

snapserver/install-librespot.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -euo pipefail
+
+if [[ "$ARCH" == "armhf" ]]; then
+  rust_bin_path="$(stat --format %n /usr/local/rustup/toolchains/*-armv7-unknown-linux-gnueabihf/bin)"
+  export PATH=${rust_bin_path}:$PATH
+fi
+
+exec cargo install librespot --version "${LIBRESPOT_VERSION}"

snapserver/run.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -euo pipefail
+
+credentials=""
+if [[ -n "${USERNAME:-}" ]] && [[ -n "${PASSWORD:-}" ]]; then
+  credentials="\&username=$USERNAME\&password=$PASSWORD"
+fi
+
+#sed  "/'\[stream\]'/a 'source = librespot:///librespot?name=Spotify\&devicename=$DEVICE_NAME\&bitrate=320\&volume=100$credentials'" /etc/snapserver.conf
+
+exec snapserver