fix: minimal guide for static assets

Author: wtrocki

README.md

@@ -58,7 +58,7 @@ with only a subset of sections having recommendations):
   * Transactions_handling
 
 * Development
-  * Static Assets
+  * [Static Assets](./static-assets.md)
   * Keeping up to date
   * Code Quality
     * [Code Consistency](./code-consistency.md)

static-assets.md

@@ -0,0 +1,19 @@
+## Static assets
+
+For serving static resources we recomend using `express.static` middleware.
+Using express.static() method, you can server static resources directly by specifying the folder name where you have stored your static resources.
+Documentation for the middleware can be found in:
+
+https://expressjs.com/en/starter/static-files.html
+
+## Caching
+
+The static middleware does no server-side caching. 
+It lets you do two methods of client-side caching: ETag and Max-Age
+If you configured your static middleware to use client side caching please make sure that 
+every modification in your code is represented as different file name. 
+
+When using bundlers you will explicitly need to generate different file names every time content changes.
+Example for webpack (most popular bundler) can be found here:
+
+https://webpack.js.org/guides/caching