Added Instrument enum, Note class and get/setNote functions. Thanks xZise!

By: EvilSeph <evilseph@unaligned.org>

paper-api/src/main/java/org/bukkit/Instrument.java

@@ -0,0 +1,34 @@
+package org.bukkit;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public enum Instrument {
+
+    PIANO((byte) 0x0), // All other
+    BASS_DRUM((byte) 0x1), // Stone
+    SNARE_DRUM((byte) 0x2), // Sand
+    STICKS((byte) 0x3), // Glass
+    BASS_GUITAR((byte) 0x4); // Wood
+
+    private final byte type;
+    private final static Map<Byte, Instrument> types = new HashMap<Byte, Instrument>();
+
+    private Instrument(byte type) {
+        this.type = type;
+    }
+
+    public byte getType() {
+        return this.type;
+    }
+
+    public static Instrument getByType(final byte type) {
+        return types.get(type);
+    }
+
+    static {
+        for (Instrument instrument : Instrument.values()) {
+            types.put(instrument.getType(), instrument);
+        }
+    }
+}