add rules text

card_view.go

@@ -6,4 +6,5 @@ type CardView struct {
 	Rank     int    `json:"rank"`
 	ImageURI string `json:"image_uri"`
 	Flavour  string `json:"flavour"`
+	Rules    string `json:"rules_text"`
 }

cmd.go

@@ -5,10 +5,10 @@ import "fmt"
 type CmdType string
 
 const (
-	ActCmd     = "a"
+	ActCmd     CmdType = "a"
-	StateCmd   = "s"
+	StateCmd           = "s"
-	DebugCmd   = "d"
+	DebugCmd           = "d"
-	InvalidCmd = "e"
+	InvalidCmd         = "e"
 )
 
 type Command struct {