Enhance project messaging

[pavithraes]

A concise description and key features can be very helpful for new users (across several domains) looking into CSP.

We can discuss some ideas here, and update the wiki homepage and README with this information.

Some ideas for "key features" from discussions with @ptomecek:

• Infrastructure-agnostic
• Highly-customizable (with adapters)
• Interoperable with PyData ecosystem
• Support for historical data, which enables robust testing