add selection sort (Py-Contributors#906)

Author: tinniaru3005

Javascript/Algorithms/selection-sort.js

@@ -0,0 +1,16 @@
+function selectionSort(arr) {
+    for (let i = 0; i < arr.length; i++) {
+      let lowest = i
+      for (let j = i + 1; j < arr.length; j++) {
+        if (arr[j] < arr[lowest]) {
+          lowest = j
+        }
+      }
+      if (lowest !== i) {
+        // Swap
+        ;[arr[i], arr[lowest]] = [arr[lowest], arr[i]]
+      }
+    }
+    return arr
+  }
+  console.log(selectionSort([3, 5, 1, 2])) // [1, 2, 3, 5]