it means "i like you very much, my lord"

Hi this is part of Shakespeare's dedication of his work The Rape of Lucrece(1594) to Lord Southampton who was one of his patrons "The love I dedicate to your lordship is without end ... What I have done is yours; what I have to do is yours; being part in all I have, devoted yours." Lord Southampton on one occasion gave Shakespeare a present of £1000 to complete a purchase. There is no documentary evidence of this however.