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Add intro to Readme #1097

Job	Run time
Python 3.9 testing with elasticsearch7	1m 48s
Python 3.9 testing with opensearch	1m 46s
Python 3.9 testing with elasticsearch8	1m 47s
Python 3.11 testing with elasticsearch7	2m 12s
Python 3.10 testing with elasticsearch8	1m 47s
Python 3.10 testing with opensearch	1m 48s
Python 3.10 testing with elasticsearch7	1m 50s
Python 3.11 testing with elasticsearch8	2m 13s
Python 3.12 testing with opensearch	1m 53s
Python 3.12 testing with elasticsearch7	1m 46s
Python 3.13 testing with elasticsearch8	1m 51s
Python 3.12 testing with elasticsearch8	1m 57s
Python 3.13 testing with opensearch	1m 53s
Python 3.13 testing with elasticsearch7	1m 49s
Python 3.11 testing with opensearch	2m 11s
	28m 31s

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