t/README: document test_grep helper

t/README: document test_grep helper

test_grep is a wrapper around grep for test assertions that prints
the file contents on failure for easier debugging.  It also accepts
'!' as its first argument for negation, which preserves the
diagnostic output that '! test_grep' would suppress.

Despite being widely used (and the preferred replacement for bare
grep in assertions), test_grep has no entry in t/README alongside
the other documented helpers like test_cmp and test_line_count.
Add one.

Signed-off-by: Michael Montalbo <redacted>
Signed-off-by: Junio C Hamano <redacted>