Create web-dev-server.md

what I ran into with web-dev-server

cmd/web-dev-server.md

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+start server with reload
+
+`wds -c web-demo-server.config.mjs --watch`
+
+Who would have though that the mocks that were setup used cookies to communicate with the client
+So I had to resort to deleting them because otherwise the cookies of the previous run were still in.
+After the reset new values are probably used. TODO verify that.
+
+I took out the customer specifics here (middleware)
+
+```javascript
+import ...
+
+/// removing the cookies makes sure the mocks work allright
+const removeCookies = () => {
+  return async (context, next) => {
+    // console.log(context); // can be turned on for debugging
+    context.request.header.cookie="";
+    return next();
+  };
+};
+
+export default {
+  open: 'demo',
+  nodeResolve: true,
+  middleware: [
+    removeCookies(),
+  ]
+};
+
+```