Added Keys class. Application subclass gets CSDK keys from Keys class.

Author: ashryanbeats

send-to-desktop-api/app/src/main/java/com/adobe/sendtodesktopapi/MainApplication.java

@@ -11,8 +11,8 @@
 public class MainApplication extends Application implements IAdobeAuthClientCredentials {
 
     /* Be sure to fill in the two strings below. */
-    private static final String CREATIVE_SDK_CLIENT_ID = "<YOUR_CLIENT_ID_HERE>";
-    private static final String CREATIVE_SDK_CLIENT_SECRET = "<YOUR_CLIENT_SECRET_HERE>";
+    private static final String CREATIVE_SDK_CLIENT_ID = Keys.CSDK_CLIENT_ID;
+    private static final String CREATIVE_SDK_CLIENT_SECRET = Keys.CSDK_CLIENT_SECRET;
 
     @Override
     public void onCreate() {