Add meta

Meta/api/SetSendMailMoney.lua

@@ -0,0 +1,6 @@
+---@diagnostic disable: missing-return, lowercase-global
+
+---@param amount number 
+---@return 1nil success 
+---Sets the amount of money to be sent with the outgoing message. Called in the default UI when clicking its Send button, immediately before sending the mail. Causes an error message if the amount plus postage exceeds the player's total money.
+function SetSendMailMoney(amount) end