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Add intro to Readme #1103

Job	Run time
Python 3.9 testing with opensearch	1m 46s
Python 3.10 testing with opensearch	1m 46s
Python 3.9 testing with elasticsearch7	1m 47s
Python 3.9 testing with elasticsearch8	1m 52s
Python 3.11 testing with elasticsearch7	2m 9s
Python 3.12 testing with elasticsearch7	1m 53s
Python 3.11 testing with elasticsearch8	2m 14s
Python 3.10 testing with elasticsearch7	1m 45s
Python 3.13 testing with elasticsearch7	1m 53s
Python 3.11 testing with opensearch	2m 9s
Python 3.10 testing with elasticsearch8	1m 52s
Python 3.12 testing with opensearch	1m 52s
Python 3.12 testing with elasticsearch8	1m 55s
Python 3.13 testing with opensearch	1m 46s
Python 3.13 testing with elasticsearch8	1m 49s
	28m 28s

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