Created Notify_join (markdown)

Notify_join.md

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+## Join Notifications
+* **Source**: https://joaoapps.com/join/
+* **Icon Support**: Yes
+* **Message Format**: Text
+* **Message Limit**: 1000 Characters per message
+
+To use this plugin:
+1. Ensure your browser allows popups and visit [joinjoaomgcd.appspot.com](https://joinjoaomgcd.appspot.com/).
+2. To register you just need to allow the page to link with your Google Profile. The good news is it doesn't ask for anything too personal.
+3. Download the app for your phone from the [Android Store here](https://play.google.com/store/apps/details?id=com.joaomgcd.join)
+
+### Syntax
+Valid syntax is as follows:
+* **join**:://**{apikey}**/**{device_id}**
+* **join**:://**{apikey}**/**{device_id1}**/**{device_id2}**/**{device_idN}**
+
+Groups can be referenced like this (the *group.* part is optional):
+* **join**:://**{apikey}**/group.**{group_id}**
+* **join**:://**{apikey}**/group.**{group_id1}**/group.**{group_id2}**/group.**{group_idN}**
+* **join**:://**{apikey}**/**{group_id}**
+* **join**:://**{apikey}**/**{group_id1}**/**{group_id2}**/**{group_idN}**
+
+You can freely mix and match these combinations as well:
+* **join**:://**{apikey}**/**{device_id}**/**{group_id}**
+
+### Parameter Breakdown
+| Variable    | Required | Description
+| ----------- | -------- | -----------
+| apikey      | Yes      | The api key associated with your Join account.
+| device_id   | No       | The device identifier to send your notification to.
+| group_id    | No       | The group identifier to send your notification to.
+
+#### Example
+Send a Join notification to all of our configured devices:
+```bash
+# Assuming our {apikey} is abcdefghijklmnop-abcdefg
+# Assume we're sending to the group: all
+notify.py join://abcdefghijklmnop-abcdefg/group.all
+```