Initial data commit

Task/Sorting-algorithms-Shell-sort/Seed7/sorting-algorithms-shell-sort.seed7

@@ -0,0 +1,21 @@
+const proc: shellSort (inout array elemType: arr) is func
+  local
+    var integer: i is 0;
+    var integer: j is 0;
+    var integer: increment is 0;
+    var elemType: help is elemType.value;
+  begin
+    increment := length(arr) div 2;
+    while increment > 0 do
+      for i range 1 to length(arr) do
+        j := i;
+        help := arr[i];
+        while j > increment and arr[j - increment] > help do
+          arr[j] := arr[j - increment];
+          j -:= increment;
+        end while;
+        arr[j] := help;
+      end for;
+      increment := increment div 2;
+    end while;
+  end func;