Created Notify_matrix (markdown)

Notify_matrix.md

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+## Matrix Notifications
+* **Source**: https://matrix.org/
+* **Icon Support**: No
+* **Message Format**: Text
+* **Message Limit**: 1000 Characters per message
+
+To use this plugin, you need to first set yourself up with https://matrix.org.
+
+### Syntax
+Valid syntaxes are as follows:
+* **matrix**://**{token}**
+* **matrix**://**{token}**?**mode=slack**
+* **matrix**://**{user}**@**{token}**?**mode=slack**
+
+Both **matrix://** and **matrixs://** are both handled in a secure fashion.
+
+### Parameter Breakdown
+| Variable    | Required | Description
+| ----------- | -------- | -----------
+| token       | Yes      | The token you would have gotten after setting up the matrix.org
+| user        | No       | The user to associate with the webhook created on matrix.org.  By default, this is set to **apprise**
+| port        | No       | The server port Matrix is listening on. By default the port is **443**.
+
+#### Example
+Send a secure Matrix.org notification to our server
+```bash
+# Assuming our {token} is 3ccdd113474722377935511fc85d3dd4
+# Assuming our {user} is caronc
+
+apprise matrix://caronc@3ccdd113474722377935511fc85d3dd4
+```