Add todoapp benchmark

bench/implementations/nim-karax-comp/readme.rst

@@ -0,0 +1,38 @@
+Karax -- Single page applications in Nim
+========================================
+
+Karax is a framework for developing single page applications in Nim.
+It's still in heavy development, so keep in mind that the API is subject
+to change.
+
+To try it out, run::
+
+  nimble install # For first time
+
+  cd examples/todoapp
+  nim js todoapp.nim
+  open todoapp.html
+  cd ../..
+
+  cd examples/mediaplayer
+  nim js playerapp.nim
+  open playerapp.html
+
+It uses a virtual DOM like React, but is much smaller than the existing
+frameworks plus of course it's written in Nim for Nim. No external
+dependencies! And thanks to Nim's whole program optimization only what
+is used ends up in the generated JavaScript code.
+
+
+Goals
+=====
+
+- Leverage Nim's macro system to produce a framework that allows
+  for the development of applications that are boilerplate free.
+- Keep it small, keep it fast, keep it flexible.
+
+
+Todo
+====
+
+- Expose a nice API to do Ajax requests.