Add README

README.md

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+# voicemail-ticketizer
+
+`voicemail-ticketizer` creates Sonar tickets of RingCentral voicemails.
+
+## Configuration
+
+```shell
+# Required API/authentication variables:
+SONAR_URL=https://instance.sonar.software/api/graphql
+SONAR_TOKEN=
+RC_APP_KEY=
+RC_APP_SECRET=
+RC_LOGIN_USERNAME=
+RC_LOGIN_EXT=
+RC_LOGIN_PASSWORD=
+
+# Set to any value to enable use of RingCentral's sandbox API
+RC_SANDBOX=
+
+DB_ENGINE=sqlite # can be pg
+# only used when DB_ENGINE=pg
+DB_URL=
+# only used when DB_ENGINE=sqlite
+DB_FILE=voicemails.db
+
+# A mapping of extension number to Sonar Ticket Group
+# Only the voicemail boxes of these extensions will be checked
+EXTENSION_TICKET_GROUPS=1:1,2:2,2:3
+```
+
+## Deployment
+
+Via `docker-compose`:
+
+```yaml
+version: "3.8"
+
+volumes:
+  data:
+
+services:
+  voicemail-ticketizer:
+    build: https://git.esis.network/esis/voicemail-ticketizer.git#master
+    restart: always
+    environment:
+      # ... see Configuration above
+      DB_FILE: /data/voicemails.db
+    volumes:
+      - data:/data
+```