Add codspeed badge (#206) #179

Job	Run time
tests (ubuntu-latest, 3.11, highest)	1m 52s
tests (ubuntu-latest, 3.11, lowest-direct)	1m 48s
tests (ubuntu-latest, 3.12, highest)	2m 22s
tests (ubuntu-latest, 3.12, lowest-direct)	2m 8s
tests (ubuntu-latest, 3.13, highest)	4m 34s
tests (ubuntu-latest, 3.13, lowest-direct)	2m 4s
tests (macos-latest, 3.11, highest)	2m 3s
tests (macos-latest, 3.11, lowest-direct)	2m 57s
tests (macos-latest, 3.12, highest)	2m 15s
tests (macos-latest, 3.12, lowest-direct)	2m 8s
tests (macos-latest, 3.13, highest)	2m 8s
tests (macos-latest, 3.13, lowest-direct)	1m 59s
tests (windows-latest, 3.11, highest)	7m 4s
tests (windows-latest, 3.11, lowest-direct)	7m 13s
tests (windows-latest, 3.12, highest)	6m 3s
tests (windows-latest, 3.12, lowest-direct)	5m 59s
tests (windows-latest, 3.13, highest)	7m 52s
tests (windows-latest, 3.13, lowest-direct)	9m 44s
	1h 12m 13s

Provide feedback