add ccr3

+ add missing ma6.config.json

cfg/main/ccr3.cfg

@@ -0,0 +1,14 @@
+[NODE]
+description = 4 K closed cycle cryostat (TriCS)
+id = ccr3.config.sea.psi.ch
+
+[sea_main]
+class = secop_psi.sea.SeaClient
+description = main sea connection for ccr3.config
+config = ccr3.config
+service = main
+
+[tt]
+class = secop_psi.sea.SeaDrivable
+io = sea_main
+sea_object = tt