Create a template landing page for use cases

[amarantha-k]

Design and add landing pages for use cases with the following information:

• Summary of the use case
• Highlight the benefits of using XRPL over other blockchains (What are the differentiating features that XRPL offers for this use case? )
• Clear journey path for different experience levels
• Link to published projects with code samples
• Links to (non-docs) related information such as learning portal, playground, etc