Added 91_Train port to MiniScript

00_Alternate_Languages/91_Train/MiniScript/README.md

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+Original source downloaded from [Vintage Basic](http://www.vintage-basic.net/games.html).
+
+Conversion to [MiniScript](https://miniscript.org).

00_Alternate_Languages/91_Train/MiniScript/train.ms

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+// TRAIN
+//
+// Converted from BASIC to MiniScript by Ryushinaka and Joe Strout
+
+while true
+	print "TRAIN"
+	print "CREATIVE COMPUTER  MORRISTOWN, NEW JERSEY"
+	print ""
+	print "TIME - SPEED DISTANCE EXERCISE"
+	
+	carSpeed = floor(25*rnd + 40)
+	difference = floor(15*rnd + 5)
+	trainSpeed = floor(19*rnd + 20)
+	print " A car traveling " + carSpeed + " MPH can make a certain trip in"
+	print difference + " hours less than a train traveling at " + trainSpeed + " MPH."
+	answer = input("How long does the trip take by car? ").val
+	carTime = difference*trainSpeed/(carSpeed-trainSpeed)
+	error = round(abs((carTime-answer)*100/answer))
+	if error < 5 then
+		print "GOOD! Answer within " + error + " PERCENT."
+	else
+		print "Sorry. You were off by " + floor(error) + " percent."
+		print "Correct answer is " + round(carTime, 1) + " hours."
+	end if
+	
+	answer = input("Another problem (YES or NO)? ")
+	if not answer or answer[0].upper != "Y" then break
+end while