Add result for the non-closable menus API

Author: coderFlameyosFlow

src/main/java/me/flame/menus/menu/Result.java

@@ -0,0 +1,42 @@
+package me.flame.menus.menu;
+
+import lombok.NonNull;
+
+public class Result {
+    public String result;
+    private static final String DENIED = "denied";
+    private static final String ALLOWED = "allowed";
+
+    private Result(String result) {
+        this.result = result;
+    }
+
+    public boolean equals(Object o) {
+        if (!(o instanceof Result)) return false;
+        Result r = (Result) o;
+        return result.equals(r.result);
+    }
+
+    public static Result denied() {
+        return new Result(DENIED);
+    }
+
+    public static Result allowed() {
+        return new Result(ALLOWED);
+    }
+
+    public void set(@NonNull Result r) {
+        String result = r.result;
+        if (!result.equals(DENIED) && !result.equals(ALLOWED))
+            throw new IllegalArgumentException(
+                    "Must be 'allowed' or 'denied'" +
+                    "\nResult = " + result +
+                    "\nFix: Change the result to 'allowed' or 'denied'"
+            );
+        this.result = result;
+    }
+
+    public boolean isDenied() {
+        return result.equals(DENIED);
+    }
+}