refactor: move app-release-template to monorepo

frontend/app-release-template/README.md

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+# App Release Template (ART)
+
+This project can be used to generate mobile device apps (Android / iOS) and the standalone Angular web app. Beware that this is only the app/frontend part and your need a fully functioning backend deployment first.
+
+## Requirements
+
+* A fully functioning and publicly accessible [backend](https://gitlab.com/openstapps/backend) deployment
+* An active Apple App Store Developer Account and/or Google Playstore Developer Account
+* Docker (Android and Angular builds)
+* MacOS Device with latest Xcode, fastlane and xmlstarlet, node v14 and npm package @ionic/cli (iOS builds only)
+
+## Docker
+
+Use weelkly updated image from this repo
+
+```bash
+docker pull registry.gitlab.com/openstapps/app-release-template:latest
+```
+
+Or build your own image from Dockerfile within this project
+
+```bash
+docker build -t openstapps-art .
+```
+
+## Usage
+
+0. If neccessary make adjustments to your app / profiles / entitlements in your corresponding developer/store portal
+1. Overwrite assets in customizable directory with your own ones (keeping the same size and file format)
+2. Edit app.conf.sample to your liking and rename it to app.conf (needs info you can find in your corresponding developer/store portal)
+3. Use docker to run `make web` and `make android` (i.e. `docker run -it -v $(pwd):/build --rm openstapps-art:latest make web`)
+4. On a macOS device run `make ios` (make sure you have all required certificates / profiles set up in Xcode)
+5. Gitlab CI runs need to be provided with SCP targets and Base64 encoded SSH private keys via env variables for web and (optionally) apk deployments