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Add intro to Readme #1101

Job	Run time
Python 3.9 testing with elasticsearch7	1m 48s
Python 3.9 testing with opensearch	1m 54s
Python 3.9 testing with elasticsearch8	1m 50s
Python 3.10 testing with opensearch	1m 46s
Python 3.11 testing with elasticsearch8	2m 9s
Python 3.12 testing with elasticsearch8	1m 48s
Python 3.10 testing with elasticsearch7	1m 46s
Python 3.10 testing with elasticsearch8	1m 54s
Python 3.11 testing with opensearch	2m 9s
Python 3.12 testing with elasticsearch7	1m 51s
Python 3.12 testing with opensearch	1m 49s
Python 3.13 testing with opensearch	1m 48s
Python 3.13 testing with elasticsearch7	1m 50s
Python 3.13 testing with elasticsearch8	1m 49s
Python 3.11 testing with elasticsearch7	2m 15s
	28m 26s

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