chore: add PR template #394

Job	Run time
rust-library-base / Feature Checks	2m 12s
rust-library-base / Base Checks / Clippy	2m 2s
rust-library-base / Base Checks / doctest	4m 9s
rust-library-base / Base Checks / Docs	1m 53s
rust-library-base / Base Checks / Test Suite	3m 45s
rust-library-base / Base Checks / Rustfmt	38s
	14m 39s

Provide feedback