Added EnvoyException class

src/main/java/envoy/exception/EnvoyException.java

@@ -0,0 +1,20 @@
+package envoy.exception;
+
+/**
+ * Project: <strong>envoy-common</strong><br>
+ * File: <strong>EnvoyException.java</strong><br>
+ * Created: <strong>27 Oct 2019</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since Envoy v0.1-alpha
+ */
+public class EnvoyException extends Exception {
+
+	private static final long serialVersionUID = 2096147309395387479L;
+
+	public EnvoyException(String message, Throwable cause) { super(message, cause); }
+
+	public EnvoyException(String message) { super(message); }
+
+	public EnvoyException(Throwable cause) { super(cause); }
+}