Add a "Getting started" guide for the dataframe API #13575

Job	Run time
cpp-paths-filter	4s
docs-paths-filter	5s
python-paths-filter	6s
rust-paths-filter	5s
web-paths-filter	4s
Checks / Check links	14s
Checks / Lint markdown	16s
Checks / Misc formatting	22s
Checks / Rerun lints	32s
Checks / Check if running codegen would produce any changes	1m 9s
Checks / Spell Check	7s
Update PR Body / Update PR body	15s
C++ tests	0s
Build rerun_js / Build rerun_js	2m 5s
Build web viewer / Build web viewer	1m 14s
Rust Checks / Test on macOS and Windows	0s
Rust Checks / Rust lints (fmt, check, clippy, tests, doc)	35s
Deploy Landing Preview / Deploy	9s
Minimum CLI Build / Set Config (linux-x64)	3s
Python Checks / Python lints (ruff, mypy, …)	34s
Python Checks / Test Python Docs	28s
Minimum CLI Build / Build rerun-cli (ubuntu-latest-16-cores)	32s
Minimum Wheel Build	0s
Minimum Wheel Test	0s
Upload Web	0s
Save PR Summary	0s
	8m 59s

Provide feedback