add introduction of fst hotwords

雾聪

2024-01-01 f047ff8aa4fb11215a3eb5a425fee77ff72e5dba

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peme    p.m.
pe eme    p.m.
p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
ame    a.m.
a eme    a.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.