Added README

Author: danilkozyrev

README.md

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+# File Storage API
+This application allows you to store files in Dropbox-like manner
+
+## Features
+* User management and access control
+* Client authorization with OAuth 2.0
+* File and folder management
+* Custom file metadata
+* File sharing using temporary links
+* Trash can for deleted files and folders
+* Search using multiple parameters 
+* Interactive API documentation
+
+## Built with
+* Spring Boot
+* Hibernate
+* Lombok
+* MapStruct
+* SpringFox
+* Auth0 Java JWT
+* Apache Tika
+* Passay
+* JUnit
+* Mockito
+* Maven