add hedgedoc

docs/hedgedoc.md

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+# Required variables
+These variables are required. Example values included. Some general variables might also be required for this role.
+
+```
+ports:
+  hedgedoc:
+    http: 8080
+
+docker_vhost_domains: 
+  hedgedoc:
+    - hedgedoc.domain.tld
+
+database_passwords:
+  hedgedoc: secret
+```

roles/hedgedoc/README.md

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+Installs hedgedoc in docker

roles/hedgedoc/meta/main.yml

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+---
+
+dependencies:
+  - role: container
+    docker_service: hedgedoc
+    docker_image: quay.io/hedgedoc/hedgedoc:latest
+    docker_image_http_port: 3000
+    docker_database: postgres
+    docker_volumes:
+      - hedgedoc_uploads:/hedgedoc/public/uploads
+    docker_env:
+      CMD_DB_URL: postgres://hedgedoc:{{ database_passwords.hedgedoc }}@hedgedoc_db:5432/hedgedoc
+      CMD_DOMAIN: "{{ docker_vhost_domains.hedgedoc[0] }}"
+      CMD_PROTOCOL_USESSL: "true"
+      CMD_ALLOW_ANONYMOUS: "false"
+      CMD_ALLOW_ANONYMOUS_EDITS: "true"
+      CMD_ALLOW_FREEURL: "true"
+