chore: Render now displays x/y axis values

render.go

@@ -1,6 +1,8 @@
 package plane
 
 import (
+	"fmt"
+	"strconv"
 	"strings"
 )
 
@@ -22,8 +24,18 @@ func GetRender(s *Surface) string {
 	}
 
 	rowVals := make([]string, 0, len(rows))
-	for _, row := range rows {
+	for i, row := range rows {
+		row = append([]string{fmt.Sprintf("%01d | ", s.height-i-1)}, row...)
 		rowVals = append(rowVals, strings.Join(row, " "))
 	}
+
+	rowVals = append(rowVals, "     "+strings.Repeat("-", s.width*2-1))
+
+	xLegendVals := []string{"    "}
+	for x := 0; x < s.width; x++ {
+		xLegendVals = append(xLegendVals, strconv.Itoa(x))
+	}
+	rowVals = append(rowVals, strings.Join(xLegendVals, " "))
+
 	return "\n" + strings.Join(rowVals, "\n")
 }