Add todoapp benchmark

bench/implementations/nim-karax-comp-local/experiments/example.nim

@@ -0,0 +1,32 @@
+
+import vdom, components, karax, karaxdsl, jdict, jstrutils
+
+var
+  images: seq[cstring] = @[cstring"a", "b", "c", "d"]
+
+proc carousel*(key: VKey): VNode {.component.} =
+  state:
+    var counter: int = 0
+
+  proc next(ev: Event; n: VNode) =
+    counter = (counter + 1) mod images.len
+
+  result = buildHtml(tdiv(key=key)):
+    text images[counter]
+    button(onclick = next):
+      text "Next"
+
+proc createDom(): VNode =
+  result = buildHtml(table):
+    tr:
+      td:
+        carousel(0)
+      td:
+        carousel(1)
+    tr:
+      td:
+        carousel(2)
+      td:
+        carousel(3)
+
+setRenderer createDom