Fix quickstart build error

Author: Mykyta-Petrov

Quick_ACG/pom.xml

@@ -163,7 +163,6 @@
                                     <directory>../src/main/java/com/docusign</directory>
                                     <includes>
                                         <include>JsonPropertySourceLoader.java</include>
-                                        <include>OSDetector.java</include>
                                         <include>EG001ControllerEmbeddedSigning.java</include>
                                     </includes>
                                 </resource>

Quick_ACG/src/main/java/com/docusign/OSDetector.java

@@ -0,0 +1,25 @@
+package com.docusign;
+
+/*
+ * This class can be used to determine the user's operating system so that the
+ * application can successfully open a web browser to run the examples.
+ */
+public class OSDetector
+{
+    private static final boolean isWindows;
+    private static final boolean isLinux;
+    private static final boolean isMac;
+
+    static
+    {
+        String os = System.getProperty("os.name").toLowerCase();
+        isWindows = os.contains("win");
+        isLinux = os.contains("nux") || os.contains("nix");
+        isMac = os.contains("mac");
+    }
+
+    public static boolean isWindows() { return isWindows; }
+    public static boolean isLinux() { return isLinux; }
+    public static boolean isMac() { return isMac; }
+
+}