Add chatwoot support system (#353)

Co-authored-by: Andrew Camilleri <kukks@btcpayserver.org>

docs/chatwoot.md

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+# Chatwoot support
+
+[Chatwoot](https://www.chatwoot.com/) is a customer support tool for instant messaging channels which can help businesses provide exceptional customer support.
+
+## How to use
+
+1. Connect as root to your server
+2. create chatwoot configuration file where `{CONFIG DATA HERE}` is replaced by settings from [here](https://www.chatwoot.com/docs/environment-variables)
+
+```bash
+sudo su -
+cd btcpayserver-docker
+cat >> Generated/chatwoot-config.env <<EOL
+{CONFIG DATA HERE}
+{CONFIG DATA HERE}
+EOL
+```
+3. Add chatwoot as an option to your BTCPay deployment and set the host to use (point DNS to server as well)
+
+```bash
+CHATWOOT_HOST="chatwoot.xpayserver.com"
+BTCPAYGEN_ADDITIONAL_FRAGMENTS="$BTCPAYGEN_ADDITIONAL_FRAGMENTS;opt-add-chatwoot"
+. btcpay-setup.sh -i
+
+```
+4. Wait for BTPay to be online and then create the database for chatwoot
+
+```bash
+docker exec -ti chatwoot sh -c "export DISABLE_DATABASE_ENVIRONMENT_CHECK=1 && bundle exec rails db:reset"
+```
+4. Go to chatwoot website at https://chatwoot.xpayserver.com and set up.
+