Add custom fields for shsspgeiger

custom_field_list.json

@@ -82,5 +82,13 @@
         ["ascent_rate", "divide_by_100"],
         ["pulse_counts","none"]
     ]
+},
+"SHSSPGEIGER": {
+    "comment": "Horus Radiation Monitor Payload, Geiger Counter",
+    "struct": "<hxxxxxH",
+    "fields": [
+        ["ascent_rate", "divide_by_100"],
+        ["pulse_counts","none"]
+    ]
 }
 }