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Add intro to Readme #1104

Job	Run time
Python 3.9 testing with elasticsearch8	1m 53s
Python 3.9 testing with elasticsearch7	1m 52s
Python 3.10 testing with elasticsearch7	1m 44s
Python 3.10 testing with opensearch	1m 49s
Python 3.9 testing with opensearch	1m 47s
Python 3.11 testing with elasticsearch8	2m 10s
Python 3.10 testing with elasticsearch8	1m 53s
Python 3.12 testing with elasticsearch8	1m 51s
Python 3.11 testing with elasticsearch7	2m 10s
Python 3.11 testing with opensearch	2m 18s
Python 3.13 testing with elasticsearch7	1m 49s
Python 3.12 testing with elasticsearch7	1m 49s
Python 3.12 testing with opensearch	1m 50s
Python 3.13 testing with elasticsearch8	1m 57s
Python 3.13 testing with opensearch	1m 53s
	28m 45s

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