Added Implementation of Linear Search

Search/linearSearch.js

@@ -0,0 +1,21 @@
+function SearchArray(searchNum, ar) {
+  var position = Search(ar, searchNum);
+  if (position != -1) {
+    console.log("The element was found at " + (position + 1));
+  } else {
+    console.log("The element not found");
+  }
+}
+
+// Search “theArray” for the specified “key” value
+function Search(theArray, key) {
+  for (var n = 0; n < theArray.length; n++)
+    if (theArray[n] == key)
+      return n;
+  return -1;
+}
+
+var ar = [1, 2, 3, 4, 5, 6, 7, 8, 9];
+SearchArray(3, ar);
+SearchArray(4, ar);
+SearchArray(11, ar);