Add Prowlarr Cloudron package

- Add CloudronManifest.json with proper metadata
- Add Dockerfile to build Prowlarr container
- Add start.sh script to launch Prowlarr
- Add icon.png for the app
- Remove old LICENSE and README.md files

Dockerfile

@@ -0,0 +1,17 @@
+FROM --platform=amd64 cloudron/base:4.2.0@sha256:46da2fffb36353ef714f97ae8e962bd2c212ca091108d768ba473078319a47f4
+
+RUN apt-get update -y && \
+    apt install -y curl sqlite3 dpkg wget
+
+RUN mkdir -p /app/code/prowlarr
+WORKDIR /app/code
+
+RUN wget --content-disposition "http://prowlarr.servarr.com/v1/update/master/updatefile?os=linux&runtime=netcore&arch=x64" && \
+    tar -xvzf Prowlarr*.linux*.tar.gz -C /app/code/prowlarr && \
+    rm -f Prowlarr*.linux*.tar.gz
+
+COPY start.sh /app/code/
+RUN chmod +x /app/code/start.sh && \
+    chown -R cloudron:cloudron /app/code/prowlarr
+
+CMD [ "/app/code/start.sh" ]