Add radicale one-click-app (#198)

* add radicale

* Adding radicale logo

* Fix version to 2.1.12.1

* Add link to documentation

* make instructions clearer + use the default volume

public/v2/apps/radicale.json

@@ -0,0 +1,32 @@
+{
+    "captainVersion": "2",
+    "documentation": "Taken from https://hub.docker.com/r/tomsquest/docker-radicale",
+    "displayName": "Radicale",
+    "description": "Radicale lightweight CalDAV and CardDAV Server",
+    "dockerCompose": {
+        "version": "3.3",
+        "services": {
+            "$$cap_appname": {
+		"containerHttpPort": "5232",
+                "image": "tomsquest/docker-radicale:$$cap_image_tag",
+                "volumes": [
+                    "$$cap_appname-data:/data"
+                ],
+                "restart": "always",
+                "environment": {}
+            }
+        }
+    },
+    "instructions": {
+        "start": "Radicale is a small but powerful CalDAV (calendars, to-do lists) and CardDAV (contacts) server. It is strongly advised to secure your data with user passwords as stated here https://hub.docker.com/r/tomsquest/docker-radicale/",
+        "end": "Radicale is deployed and available as $$cap_appname. To secure your user you can create a config like https://github.com/tomsquest/docker-radicale/blob/master/config and adapt it like stated here https://radicale.org/3.0.html#tutorials/basic-configuration. You need to create an volume pointing to the container path /etc/radicale/config to be picked up by the image."
+    },
+    "variables": [{
+            "id": "$$cap_image_tag",
+            "label": "What version/tag do you want?",
+            "description": "Go here to see all versions https://hub.docker.com/r/tomsquest/docker-radicale/tags",
+            "defaultValue": "2.1.12.1",
+            "validRegex": "/^([^\\s^\\/])+$/"
+        }
+    ]
+}