Create the directory if not exists

backend/src/main/java/ovh/herisson/Clyde/Services/StorageService.java

@@ -24,6 +24,14 @@ public class StorageService {
 
     public StorageService(FileRepository filerepo){
         this.fileRepo = filerepo;
+
+		if(!Files.exists(rootLocation)){
+			try {
+				Files.createDirectories(rootLocation);
+			} catch(IOException e){
+				e.printStackTrace();
+			}
+		}
     }