Insert line after match using sed

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For some reason I can’t seem to find a straightforward answer to this and I’m on a bit of a time crunch at the moment. How would I go about inserting a choice line of text after the first line matching a specific string using the sed command. I have …

CLIENTSCRIPT="foo"
CLIENTFILE="bar"

And I want insert a line after the CLIENTSCRIPT= line resulting in …

CLIENTSCRIPT="foo"
CLIENTSCRIPT2="hello"
CLIENTFILE="bar"

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