feat: add remove element solution

Author: marcode24

leetcode/remove-element/README.md

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+# Remove Element
+
+## Description

leetcode/remove-element/solution.js

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+const removeElement = (nums, val) => {
+  let i = 0;
+  for (let j = 0; j < nums.length; j++) {
+    if (nums[j] !== val) {
+      nums[i] = nums[j];
+      i++;
+    }
+  }
+  return i;
+};
+
+module.exports = removeElement;

leetcode/remove-element/solution.test.js

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+const removeElement = require('./solution');
+
+describe('Remove Element', () => {
+  const testCases = [
+    {
+      input: [
+        [3, 2, 2, 3],
+        3,
+      ],
+      output: 2,
+    },
+    {
+      input: [
+        [0, 1, 2, 2, 3, 0, 4, 2],
+        2,
+      ],
+      output: 5,
+    },
+  ];
+
+  it('should return a number type', () => {
+    expect(typeof removeElement([1, 1, 2])).toBe('number');
+  });
+
+  it.each(testCases)('should return $output', (testCase) => {
+    expect(removeElement(...testCase.input)).toBe(testCase.output);
+  });
+});