Created Notify_signal (markdown)

Notify_signal.md

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+## Signal API
+* **Source**: https://github.com/bbernhard/signal-cli-rest-api
+* **Icon Support**: No
+* **Message Format**: Text
+* **Message Limit**: 32768 Characters per message
+
+### Account Setup
+This plugin assumes you have configured yourself up with the [Signal Rest API Service](https://github.com/bbernhard/signal-cli-rest-api)
+The **{FromPhoneNo}** must be the number associated with your account.
+
+### Syntax
+Valid syntax is as follows:
+* `signal://{user}:{password}@{hostname}/{from_phone}`
+* `signal://{user}:{password}@{hostname}:{port}/{from_phone}`
+* `signal://{user}:{password}@{hostname}/{from_phone}/{to_phone}`
+* `signal://{user}:{password}@{hostname}:{port}/{from_phone}/{from_phone}`
+
+You can post in multiple chats by simply chaining them at the end of the URL.
+* `signal://{user}:{password}@{hostname}:{port}/{from_phone}/{to_phone1}/{to_phone2}/{to_phone3}`
+* `signals://{user}:{password}@{hostname}:{port}/{from_phone}/{to_phone1}/{to_phone2}/{to_phone3}`
+
+### Parameter Breakdown
+| Variable        | Required | Description
+| --------------- | -------- | -----------
+| hostname    | Yes      | The Web Server's hostname
+| port        | No       | The port our Web server is listening on. By default the port is **80** for **signal://** and **443** for all **singals://** references.
+| user        | No       | If you're system is set up to use HTTP-AUTH, you can provide _username_ for authentication to it.
+| password    | No       | If you're system is set up to use HTTP-AUTH, you can provide _password_ for authentication to it.
+| from     |  Yes  | This must be a _From Phone Number_ you've added to the API service.
+| to         | **\*No**   | A phone number you wish to send your notification to.  If one isn't specified, then the `from` is used instead.
+| batch     |  No  | Send multiple specified notifications in a single batch (1 upstream post to the end server).  By default this is set to `no`.
+| status     |  No  | Optionally include a small little ASCII string representing the notification status being sent (inline with it)  by default this is set to `no`.
+
+#### Example
+Send a Signal Notification (via Signal API):
+```bash
+# Assuming our {Hostname} is localhost (hosting the bbernhard/signal-cli-rest-api)
+# Assuming our {FromPhoneNo} is +1-900-555-9999
+# Assuming our {PhoneNo} - is in the US somewhere making our country code +1
+#                        - identifies as 800-555-1223
+apprise -vv -t "Test Message Title" -b "Test Message Body" \
+   signal://localhost/19005559999/18005551223
+
+# the following would also have worked (spaces, brackets,
+# dashes are accepted in a phone no field):
+apprise -vv -t "Test Message Title" -b "Test Message Body" \
+   signal://localhost/1-(900) 555-9999/1-(800) 555-1223
+```