Create README.md

Author: Dokyeongyun

DBMonitoringDownloaderApp/README.md

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+# DB Monitoring Downloader App
+
+## Preview
+
+![Downloader_site_capture](https://user-images.githubusercontent.com/61186671/171548645-fc2f4ffc-834a-4457-9ba7-bdf205b09a35.png)
+
+## About this project
+This project's purpose is that download DBMonitoring window application
+on website for anyone who want my DBMonitoring window application. This downloader 
+project is created by using below software and tools.
+
+**Project Spec**
+- JDK version : 15 
+- Server 
+  - Framework : Spring boot (2.6.7)
+  - WAS : Spring boot embedded tomcat (9.0.62 version)
+- Build Tool : gradle (7.4.2 version)
+- Template engine : Thymeleaf