Function indy_sys::pairwise::indy_create_pairwise

#[no_mangle]
pub unsafe extern "C" fn indy_create_pairwise(
    command_handle: Handle, 
    wallet_handle: Handle, 
    their_did: CString, 
    my_did: CString, 
    metadata: CString, 
    cb: Option<ResponseEmptyCB>
) -> Error