A test case leveraging json:// to communicate with Synology Chat

[caronc]

Description:

Related issue (if applicable): #908

Initially before going all out and creating #944, this is just a single test case showing how you can structure a json:// to communicate with Synology Chat (as defined by their api).

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@908-synology-format-testcase

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  "jsons://localhost:8081/webapi/entry.cgi?' \
        '-api=SYNO.Chat.External&-method=incoming&-version=2&-token={your-token-here}' \
        '&:message=text&:version=&:type=&:title=&:attachments' \
        '&:file_url=https://i.redd.it/my2t4d2fx0u31.jpg"

[caronc]

Closed as changes already made it to master here