Add CxReports

[mstijak]

Thanks for taking the time to suggest an addition to awesome-selfhosted!

Please fill out information below (all fields are mandatory unless noted otherwise):

name: "CxReports"
website_url: "https://www.cx-reports.com/"
description: "Self-hosted reporting and PDF document generation with a user-friendly WYSIWYG template editor, API, automated email delivery, and robust security features. Free licenses available to registered users for low-volume reporting."
platforms:
  - Docker
tags:
  - Automation
  - Reporting
  - PDF
depends_3rdparty: true
demo_url: "https://demo.cx-reports.com"

To ensure your issue is dealt with swiftly, please check the following (check the boxes [x]):

• [x] Submit one item per pull issue. This eases reviewing and speeds up inclusion.
• [x] You have searched the repository for any relevant issues or PRs, including closed ones.
• [x] Any software you are adding is not already listed at any of awesome-sysadmin, staticgen.com, staticsitegenerators.net, dbdb.io.
• [x] Any software project you are adding to the list is actively maintained.
• [x] Any software project you are adding was first released more than 4 months ago.
• [x] Any software project you are adding has working installation instructions.

CxReports is not free, but I cannot find instructions how to add it to the Non-Free section.