Add gnome sort

GnomeSort.nim

@@ -0,0 +1,16 @@
+proc gnomeSort(list:var seq[int]) = 
+    var
+        i = 0
+    while i < list.high:
+        if list[i] > list[i + 1]:
+            swap(list[i + 1], list[i])
+            if i > 0:
+                dec i
+        else:
+            inc i
+
+when isMainModule:
+    var
+        seq1 = @[1, 3, 2, 56, 2, 1, 32, 45, 23, 41, 6, 47, 212, 32, 6, 98, 54, 457, 37, 4]
+    gnomeSort(seq1)
+    echo seq1