Added Suit Enum class to main src folder

src/main/java/io/zipcoder/casino/Suit.java

+package io.zipcoder.casino;
+
+public enum Suit {
+    CLUBS('\u2660'),
+    DIAMONDS('\u2666'),
+    HEARTS('\u2665'),
+    SPADES('\u2663');
+
+    private Character symbol;
+
+    Suit(char c) {
+        this.symbol = c;
+    }
+
+    public Character getSymbol() {
+        return symbol;
+    }
+
+    public void setSymbol(Character symbol) {
+        this.symbol = symbol;
+    }
+}