Added: Add Clouflare funders logo

- https://www.cloudflare.com
- https://packages-cf.termux.dev

Clouflare has served around 36TB (32TB cached) data, 39M requests, 1M unique visitors in last 30 days for our https://termux.dev domain, and has potentially served 100s to 1000s of TBs of data over the years for free for Termux, primarily from the https://packages-cf.termux.dev `apt` packages repo, which is a cloudflare backed variant of our primary repo https://packages.termux.dev.

The `cloudflare.png` logo is sourced from www.cloudflare.com/press-kit