Added new Configuration classes

By: Dinnerbone <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/configuration/InvalidConfigurationException.java

@@ -0,0 +1,39 @@
+package org.bukkit.configuration;
+
+/**
+ * Exception thrown when attempting to load an invalid {@link Configuration}
+ */
+public class InvalidConfigurationException extends Exception {
+    /**
+     * Creates a new instance of InvalidConfigurationException without a message or cause.
+     */
+    public InvalidConfigurationException() {}
+
+    /**
+     * Constructs an instance of InvalidConfigurationException with the specified message.
+     *
+     * @param msg The details of the exception.
+     */
+    public InvalidConfigurationException(String msg) {
+        super(msg);
+    }
+
+    /**
+     * Constructs an instance of InvalidConfigurationException with the specified cause.
+     *
+     * @param cause The cause of the exception.
+     */
+    public InvalidConfigurationException(Throwable cause) {
+        super(cause);
+    }
+
+    /**
+     * Constructs an instance of InvalidConfigurationException with the specified message and cause.
+     *
+     * @param cause The cause of the exception.
+     * @param msg The details of the exception.
+     */
+    public InvalidConfigurationException(String msg, Throwable cause) {
+        super(msg, cause);
+    }
+}