Add details on the C API to the project README #1488

Job	Run time
Configure	4s
Integration Neko	4m 30s
Lint / Lint	4m 28s
Unit Rust / ubuntu-latest	4m 29s
Documentation / Docs	4m 29s
Image / Test-images-3.10	4m 10s
Miri / Miri	4m 28s
Unit Python / macOS / Python oldest / macos-15 - Python 3.10	4m 31s
Unit Python / macOS / Python newest / macos-15 - Python 3.14	4m 35s
QPY / Test	4m 27s
Unit Python / Linux / Python oldest - ubuntu-24.04-arm / ubuntu-24.04-arm - Python 3.10	4m 30s
Unit C / ubuntu-latest / ubuntu-latest	2m 38s
Unit C / macos-15 / macos-15	2m 42s
Unit C / windows-latest / windows-latest	4m 20s
Unit Python / Windows / Python oldest / windows-latest - Python 3.10	3m 31s
Unit Python / Linux / Python newest - ubuntu-latest / ubuntu-latest - Python 3.14	4m 27s
Unit Python / Linux / Python newest - ubuntu-24.04-arm / ubuntu-24.04-arm - Python 3.14	4m 29s
Unit Python / Windows / Python newest / windows-latest - Python 3.14	3m 30s
Unit Python / Linux / Python oldest - ubuntu-latest / ubuntu-latest - Python 3.10	4m 28s
Unit C / ubuntu-24.04-arm / ubuntu-24.04-arm	2m 44s
Finalize	1s
	1h 17m 31s

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