added conda installation instructions #1348

Job	Run time
python38 / download-conformance-client	8s
python39 / download-conformance-client	6s
python37 / download-conformance-client	5s
python310 / download-conformance-client	8s
python311 / download-conformance-client	8s
python37 / run-buildpack-integration-test (cloudevent)	34s
python37 / run-buildpack-integration-test (http)	39s
python37 / run-buildpack-integration-test (event)	3s
python39 / run-buildpack-integration-test (cloudevent)	1m 0s
python39 / run-buildpack-integration-test (event)	3s
python39 / run-buildpack-integration-test (http)	59s
python310 / run-buildpack-integration-test (cloudevent)	58s
python310 / run-buildpack-integration-test (http)	1m 10s
python310 / run-buildpack-integration-test (event)	3s
python38 / run-buildpack-integration-test (http)	1m 5s
python38 / run-buildpack-integration-test (cloudevent)	1m 16s
python38 / run-buildpack-integration-test (event)	3s
python311 / run-buildpack-integration-test (cloudevent)	1m 5s
python311 / run-buildpack-integration-test (http)	3m 37s
python311 / run-buildpack-integration-test (event)	5s
	13m 15s

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