add DF logos #281

Job	Run time
code-coverage-torchcfm	3m 2s
run_tests_ubuntu (ubuntu-latest, 3.8)	2m 20s
run_tests_ubuntu (ubuntu-latest, 3.9)	2m 24s
run_tests_ubuntu (ubuntu-latest, 3.10)	2m 50s
run_tests_ubuntu (ubuntu-latest, 3.11)	2m 20s
run_tests_ubuntu (ubuntu-20.04, 3.8)	2m 23s
run_tests_ubuntu (ubuntu-20.04, 3.9)	3m 31s
run_tests_ubuntu (ubuntu-20.04, 3.10)	2m 12s
run_tests_ubuntu (ubuntu-20.04, 3.11)	2m 29s
run_tests_ubuntu (macos-latest, 3.8)	2m 33s
run_tests_ubuntu (macos-latest, 3.9)	3m 16s
run_tests_ubuntu (macos-latest, 3.10)	2m 26s
run_tests_ubuntu (macos-latest, 3.11)	2m 25s
run_tests_ubuntu (windows-latest, 3.8)	5m 11s
run_tests_ubuntu (windows-latest, 3.9)	5m 15s
run_tests_ubuntu (windows-latest, 3.10)	3m 53s
run_tests_ubuntu (windows-latest, 3.11)	4m 34s
	53m 4s

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