doc: Updated Example Docs

example/README.md

@@ -7,7 +7,7 @@ This folder holds a simple command line application with only 3 commands, `help`
 The application has 3 source code files:
 * `app/HelloWorldCommand.php`
 * `app/OpenFileCommand.php`
-* `app/app.php`
+* `app/main.php`
 
 
 The first two are used to implement two custom commands, `hello` and `open-file`. The last source file acts as the entry point of the application.
@@ -19,4 +19,4 @@ In addition to given sources, the folder `tests` contain one file which shows ho
 The first step in running the application is to install any dependencies that are needed. 
 
 To install them, run the command `php composer install` while begin in the root directory of the library. 
-After that, navigate to the folder that has the sample application and run `php app.php -i` to start the application in interactive mode.
+After that, navigate to the folder that has the sample application and run `php main.php -i` to start the application in interactive mode.