docs: add readme

README.md

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+# ansible-role-freshrss
+
+This role deploys [FreshRSS](https://www.freshrss.org/) to your server(s).
+
+It **does not** deploy php, nor a webserver or a database. However, it does install the dependencies for FreshRSS, including php-sqlite3 in case you want to use a simple SQLite database.
+
+## Example playbook
+
+```yaml
+- name: Deploy FreshRSS
+  hosts: freshrss
+  become: true
+
+  roles:
+    - freshrss
+```
+
+## Example var file
+
+```yaml
+freshrss_root_dir: "/var/www"
+freshrss_path: "/var/www/rss"
+freshrss_version: "1.27.1"
+freshrss_refresh_interval: 15 # every 15 minutes
+```
+
+## FreshRSS configuration
+
+It's done once deployed, navigate to the address you’ve installed your server to complete the installation from the GUI.
+
+## License
+
+This project is licensed under the GNU General Public License v3.0 or later (GPLv3+). See the [LICENSE](LICENSE) file for details.