modify pictures file names and README.md

Author: Wasin Waeosri

README.md

@@ -47,12 +47,12 @@ The project includes the following files and folder
 3. If the machine is behind a proxy server, you need to configure Node.js uses proxy instead of a direct HTTP connection via the following command in command prompt: ```set https_proxy=http://<proxy.server>:<port>```
 4. Run ```$> webpack``` in the command prompt to build and compile all TypeScript files in *src* into JavaScript source file (*/web/dist/* folder)
 
-![webpack command display](images/webpack.png "webpack command display")
+![webpack command display](images/webpack_screen.png "webpack command display")
 
 5. Copy and deploy the *web* folder into in any web server (recommend [http-server](https://www.npmjs.com/package/http-server) for quick dev/testing)
 6. Open web browser, then navigate to index.html of the web server (example for http-server: ```hhttp://localhost:8080/index.html```)  
 
-![application display](images/application.png "application display")
+![application display](images/application_screen.png "application display")
 
 ## References
 For further details, please check out the following resources: