Read from file and write to file

 Perform following steps,

1. import path from 'path';
• Need for path of files in order to access them
2. import fs from 'fs';
• Need for read and write on files
3. In order to read or write, first we need to resolve the directory of the file
• path.resolve(__dirname, 'directoryPath')
4. For reading, need to parse before read (reading JSON file)
• JSON.parse(fs.readFileSync(dirVar,'utf-8'))
5. For writing, need to join the file name with directory (writing JSON file)
• fs.writeFileSync( join(dirVar, 'filename'), JSON.stringify(contentVar) )