add LanguageTool for Collabora community container

Signed-off-by: Simon L. <szaimen@e.mail.de>

community-containers/languagetool/languagetool.json

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+{
+    "aio_services_v1": [
+        {
+            "container_name": "nextcloud-aio-languagetool",
+            "display_name": "LanguageTool for Collabora",
+            "documentation": "https://github.com/nextcloud/all-in-one/tree/main/community-containers/languagetool",
+            "image": "erikvl87/languagetool",
+            "image_tag": "latest",
+            "internal_port": "8010",
+            "restart": "unless-stopped",
+            "environment": [
+                "TZ=%TIMEZONE%"
+            ]
+        }
+    ]
+}

community-containers/languagetool/readme.md

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+## LanguageTool for Collabora
+This container bundles a LanguageTool for Collabora which adds spell checking functionality to Collabora.
+
+### Notes
+- Make sure to have collabora enabled via the AIO interface
+- After adding this container via the AIO Interface, while all containers are still stopped, you need to scroll down to the `Additional Collabora options` section and enter `--o:languagetool.enabled=true --o:languagetool.base_url=http://nextcloud-aio-languagetool:8010/v2`.
+- See https://github.com/nextcloud/all-in-one/tree/main/community-containers#community-containers how to add it to the AIO stack
+
+### Repository
+https://github.com/Erikvl87/docker-languagetool
+
+### Maintainer
+https://github.com/szaimen