Add Apprise notification integration (#10451)

* Add Apprise notification integration

* updated to accomodate code review

* updated to reference apprise tagging support

* ha_version + grammer as per code review

* ✏️ Tweaks

source/_components/apprise.markdown

@@ -0,0 +1,85 @@
+---
+title: "Apprise"
+description: "Instructions on how to add Apprise notifications to Home Assistant."
+logo: apprise.png
+ha_category:
+  - Notifications
+ha_release: "0.101"
+---
+
+The [Apprise service](https://github.com/caronc/apprise/) is an all-in-one solution to open up Home Assistant to _just about_ every Notification platform (such as Amazon SNS, Discord, Telegram, Slack, MSTeams, Twilio, etc.
+
+To use Apprise supported notifications, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry using URLs
+notify:
+  - platform: apprise
+    url: YOUR_APPRISE_URLS
+```
+
+You can also pre-define your own configuration files while storing them either remotely or locally. Simply just use the `config` option.
+
+```yaml
+# Example configuration.yaml entry using externally located Apprise
+# Configuration Files/Sites:
+notify:
+  - platform: apprise
+    config: YOUR_APPRISE_CONFIG_URLS
+```
+
+There is no restriction on the number of URLs or Apprise Configuration locations you wish to define. You can also use both of the lines in conjunction with one another:
+
+```yaml
+# Example configuration.yaml entry using all options
+notify:
+  - platform: apprise
+    config: YOUR_APPRISE_CONFIG_URLS
+    url: YOUR_APPRISE_URLS
+```
+
+{% configuration %}
+name:
+  description: The notifier will bind to the service `notify.NAME`.
+  required: false
+  type: string
+  default: notify
+url:
+  description: One or more Apprise URLs
+  required: false
+  type: string
+config:
+  description: One or more Apprise Configuration URLs
+  required: false
+  type: string
+{% endconfiguration %}
+
+#### Example service call
+
+```yaml
+- service: notify.apprise
+  data:
+    message: "A message from Home Assistant"
+```
+
+If you're using configuration files to store your Apprise URLs in, then you have the added bonus of associating tags with them. By default, Apprise in Home Assistant will only notify the elements that have no tags associated with them. You can optionally focus on only notifying a specific service based on the tag(s) you assigned them like so:
+
+```yaml
+- service: notify.apprise
+  data:
+    message: "A message from Home Assistant"
+    target: [
+      "tag_name1",
+    ]
+```
+
+The tag `all` is reserved to notify absolutely everything, whether you have a tag associated with a URL or not.
+
+### Notes
+
+There are over 50 supported Notification services supported by Apprise. Each has their own tweaks and customizations you can leverage.
+
+- For instructions on how to construct the URLs, visit [here](https://github.com/caronc/apprise/wiki#notification-services).
+- For instructions on how you can customize your own Apprise configuration files (referenced through the `config` directive), check out the following:
+   - [Text Formatted URLs](https://github.com/caronc/apprise/wiki/config_text)
+   - [YAML Formatted URLs](https://github.com/caronc/apprise/wiki/config_yaml)