Added NodeJS cli calculator app

CONTRIBUTING.md

@@ -254,3 +254,9 @@ INSTITUTE/COMPANY :  KLE Technological University<br>
 DOMAIN/LANGUGAE : Java<br>
 --------------
 
+-----
+NAME : Tadas Vosylius <br>
+GITHUB : [tadasvosylius](https://github.com/tadasvosylius)<br>
+INSTITUTE/COMPANY : None<br>
+DOMAIN/LANGUGAE : JavaScript<br>
+------

NodeJS/cli-calculator/README.md

@@ -0,0 +1,7 @@
+## NodeJS CLI Calculator
+### Usage:
+To run program, type in terminal `node app.js [operation] [arg1] [arg2]`. 
+
+Available operations: `add, substract, divide, multiply`
+
+Example: `node app.js substract 23 13`

NodeJS/cli-calculator/app.js

@@ -0,0 +1,30 @@
+const argv = process.argv.slice(2);
+const operation = argv[0];
+const operators = [];
+
+operators[0] = parseInt(argv[1]);
+operators[1] = parseInt(argv[2]);
+
+switch (operation) {
+  case 'add':
+    outputToConsole(operation, '+', operators);
+    console.log('Result: ' + (operators[0] + operators[1]));
+    break;
+  case 'subtract':
+    outputToConsole(operation, '-', operators);
+    console.log('Result: ' + (operators[0] - operators[1]));
+    break;
+  case 'multiply':
+    outputToConsole(operation, '*', operators);
+    console.log('Result: ' + (operators[0] * operators[1]));
+    break;
+  case 'divide':
+    outputToConsole(operation, '/', operators);
+    console.log('Result: ' + (operators[0] / operators[1]));
+    break;
+}
+
+function outputToConsole(operation, operationSymbol, operators) {
+  console.log('Operation: ' + operation);
+  console.log('Condition: ' + operators[0] + ' ' + operationSymbol + ' ' + operators[1]);
+}