Initial data commit

Task/Sorting-algorithms-Merge-sort/E/sorting-algorithms-merge-sort.e

@@ -0,0 +1,20 @@
+def merge(var xs :List, var ys :List) {
+    var result := []
+    while (xs =~ [x] + xr && ys =~ [y] + yr) {
+        if (x <= y) {
+            result with= x
+            xs := xr
+        } else {
+            result with= y
+            ys := yr
+        }
+    }
+    return result + xs + ys
+}
+
+def sort(list :List) {
+    if (list.size() <= 1) { return list }
+    def split := list.size() // 2
+    return merge(sort(list.run(0, split)),
+                 sort(list.run(split)))
+}