Add Billing

[kdeldycke]

https://github.com/kdeldycke/awesome-billing

Knowledge base about payments, invoicing, pricing, accounting, marketplace, fraud, and business intelligence.

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Failure to properly do so will just result in the pull request being closed and everyone's time wasted. Please read it twice. Most people miss many things.

• I have read and understood the contribution guidelines.
• This pull request has a descriptive title. For example, Add [Name of List], not Update readme.md or Add an awesome list.
• The list I added has been around for at least 20 days,
• The list I added is a non-generated Markdown file in a GitHub repo,
• The list I added is not a duplicate

[xugj-gits]

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[SpinYang]

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