Created Notify_threema (markdown)

Notify_threema.md

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+## Threema Gateway Notifications
+* **Source**: ttps://gateway.threema.ch/
+* **Icon Support**: No
+* **Message Format**: Text
+* **Message Limit**: 3500 Characters per Message
+
+### Setup
+You need to first set up an account with [Threema](https://gateway.threema.ch/) which will grant you access to your Threema 8 character User ID (which starts with an asterix (`*`). e.g `*THREEMA`
+
+## Account Setup
+* Create your Threema Gateway account at https://gateway.threema.ch/ and confirm your E-Mail address
+* For credits:
+     * Ask them via E-Mail for test credits and we will get you covered for some testing
+     * OR acquire them after logging into your Gateway account.
+* Request your Simple or E2E Gateway ID.  From their, they will then create your ID and you will find the corresponding ID secret on the ID overview page.
+
+### Syntax
+Valid syntax is as follows:
+
+- ```threema://{gateway_id}@{secret}/{user}```
+- ```threema://{gateway_id}@{secret}/{user1}/{user2}/{user3}/{userN}```
+- ```threema://{gateway_id}@{secret}/{email}```
+- ```threema://{gateway_id}@{secret}/{email1}/{email2}/{email3}/{emailN}```
+- ```threema://{gateway_id}@{secret}/{phone}```
+- ```threema://{gateway_id}@{secret}/{phone1}/{phone2}/{phone3}/{phoneN}```
+
+You can freely mix/match the variables as well:
+- ```threema://{gateway_id}@{secret}/{phone1}/{user1}/{email1}/...```
+
+### Parameter Breakdown
+
+| Variable | Required | Description |
+|----------|----------|-------------|
+| gateway_id | Yes| Your Gateway ID (8 characters that usually start with  a `+`. You may use `?from=`  (or `gwid`) as an alias to this variable. These usually start with an asterisk (`*`) such as `*MYGWYID` |
+| secret | Yes| Your Threema API Secret associated with your account.  You may use `?secret=` as an alias to this variable. |
+| target | No| Specfiy Threema UserID, Email Address, or Phone No.  If no target is specified then your User ID is used instead.  There is no limit to the number of targets you specify.  You may use `?to=` as an alias to this variable.|
+
+
+#### Example
+Send a Threema (Gateway) Simple notification
+```bash
+# Assume:
+#  - our {gateway_id} is *MYGWYID
+#  - our {secret} is abc123-2345
+#  - The {toPhoneNo} is 6135551234
+apprise -vv -t "Test Message Title" -b "Test Message Body" \
+   threema://*MYGWYID@abc123-2345/6135551234
+```
+
+Send a Threema (Gateway) Simple notification to another Threema User:
+```bash
+# Assume:
+#  - our {gateway_id} is *MYGWYID
+#  - our {secret} is abc123-2345
+#  - The {toThreemaID} is FRIENDID
+apprise -vv -t "Test Message Title" -b "Test Message Body" \
+   threema://*MYGWYID@abc123-2345/FRIENDID
+```