Add robot grid problem

08_recursion_and_dynamic_programming/02_robotGrid.js

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+/* 
+  Imagine a robot sitting on the upper left corner of grid with r rows and c columns
+  The robot can only move in two directions, right and down, but certain cells are
+  'off limits' such that the robot cannot step on them. Design an algorithm to find
+  a path for the robot from the top left to the bottom right.
+*/
+
+function robotGrid(grid) {
+  // Your code here
+}
+
+module.exports = robotGrid;

08_recursion_and_dynamic_programming/02_robotGrid.test.js

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+'use strict';
+
+const assert = require('chai').assert;
+const robotGrid = require('./02_robotGrid');
+
+describe('recursion and dynamic programming', function() {
+  describe('robot grid', function() {
+    it('should return a valid path', function() {
+      const matrix = [[0, 0, 0],
+                      [0, 0, 0],
+                      [0, 0, 0]]
+
+      assert.equal(robotGrid(matrix).length, 4);
+    })
+  })
+})