add HK subservice enum

satrs-core/src/pus/hk.rs

@@ -0,0 +1,2 @@
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum Subservice {}

satrs-core/src/pus/mod.rs

@@ -12,6 +12,7 @@ use spacepackets::{ByteConversionError, SizeMissmatch};
 
 pub mod event;
 pub mod event_man;
+pub mod hk;
 pub mod verification;
 
 /// Generic error type which is also able to wrap a user send error with the user supplied type E.