<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add_projection(query_proto, *projection):
 """Add projection properties to the given datatstore.Query proto message."""

  for p in projection:
    proto = query_proto.projection.add()
    proto.property.name = p