Is "come" a transitive or intransitive verb?
Come is an intransitive verb. See explanation.
A verb is transitive if it can have a direct object. The example of such a verb can be to write. In a sentence I can say: "I write a letter/an essay etc." So I can add an object (what I write).
I cannot add an object to a sentence with come therefore it is an intransitive verb.
Other way to check if a verb is transitive or intransitive is to try writing a sentence in Passive Voice. If it is possible then the verb is transitive, else the verb is intransitive.
With the given verb it is possible: The letter was/has been written
Therefore write is transitive.