Add tasks for all the new languages

Task/Binary-search/Sidef/binary-search-2.sidef

@@ -0,0 +1,13 @@
+func binary_search(arr, value, low=0, high=arr.end) {
+    high < low && return -1;
+    var middle = (high+low / 2 -> int);
+
+    if (value < arr[middle]) {
+        return binary_search(arr, value, low, middle-1);
+    }
+    elsif (value > arr[middle]) {
+        return binary_search(arr, value, middle+1, high);
+    }
+
+    return middle;
+}