Add an introduction to utility function NewJSONReader in USER_GUIDE (… #851

Job	Run time
integration-test-compatibility (true, 1.1.0)	1m 31s
integration-test-compatibility (true, 1.2.4)	1m 9s
integration-test-compatibility (true, 1.3.8)	1m 23s
integration-test-compatibility (true, 2.0.1)	1m 16s
integration-test-compatibility (true, 2.1.0)	1m 15s
integration-test-compatibility (true, 2.2.1)	1m 16s
integration-test-compatibility (true, 2.3.0)	1m 7s
integration-test-compatibility (true, 2.4.1)	1m 17s
integration-test-compatibility (true, 2.5.0)	1m 34s
integration-test-compatibility (false, 1.1.0)	1m 35s
integration-test-compatibility (false, 1.2.4)	1m 56s
integration-test-compatibility (false, 1.3.8)	2m 6s
integration-test-compatibility (false, 2.0.1)	2m 49s
integration-test-compatibility (false, 2.1.0)	1m 56s
integration-test-compatibility (false, 2.2.1)	1m 38s
integration-test-compatibility (false, 2.3.0)	1m 45s
integration-test-compatibility (false, 2.4.1)	1m 47s
integration-test-compatibility (false, 2.5.0)	2m 2s
	29m 22s

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