developing react useSSE hook.

To start developing do the following steps:

1. install the top folder
2. build the top folder
3. install example/db folder
4. duplicate the initial-db.json file and name it db.json
5. start db
6. install example/server folder
7. start server
8. install example/client folder
9. in the root folder run npm link ./example/client/node_modules/react.
10. start client

Now when editing the useSSE function in the top src folder, you should see and update in the browser.