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Add intro to Readme #1106

Job	Run time
Python 3.9 testing with elasticsearch8	1m 52s
Python 3.9 testing with opensearch	1m 50s
Python 3.10 testing with elasticsearch7	1m 45s
Python 3.10 testing with opensearch	2m 7s
Python 3.10 testing with elasticsearch8	1m 49s
Python 3.11 testing with elasticsearch8	2m 16s
Python 3.9 testing with elasticsearch7	1m 48s
Python 3.12 testing with opensearch	1m 48s
Python 3.12 testing with elasticsearch8	1m 52s
Python 3.11 testing with opensearch	2m 7s
Python 3.13 testing with opensearch	1m 49s
Python 3.11 testing with elasticsearch7	2m 13s
Python 3.12 testing with elasticsearch7	1m 49s
Python 3.13 testing with elasticsearch8	1m 56s
Python 3.13 testing with elasticsearch7	1m 52s
	28m 53s

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