Add read and write to file functionality

[louicoder]

• add new folder named Files in App folder
• add new folder inside Files folder called FilesUtility
• inside Files Utility, create a new file called readAndWriteToFiles.js
• inside readAndWriteToFiles file add two functions one for writing to files called writeToTextFile and the other readFromTextFile
• make sure both functions are to exported from this file to be used in other files.

Make sure to check all the requirements before raising a PR for this issue