Sum of params

Read the guideline before start

• Read params from a command line and print the result of addition or multiplication
  • node src/app.js add 1 2 3 4 5 should print 15 - the sum of all numbers
  • node src/app.js multiply 3 4 5 should print 60 - the product of 3 * 4 * 5
• For any other operation print Operation is not supported!
• Skip all not numeric values
• If there are no numeric values, print There is nothing to add (or multiply)